Evidence, indexed.
A curated literature index covering iris structure, pupil dynamics and biological pattern formation. Each finding stays connected to its actual measurement method and study design.
Browse by discipline
Publications
Iris Structure
Anatomy, texture, genetics and quantitative imaging. Retinal and external-eye studies appear here only as clearly marked adjacent ocular evidence—not as evidence for iris-based diagnosis.
2026OriginalRetinal age gap and systemic ageing
Trofimova et al. · Nature CommunicationsModel-derived retinal age gap was associated with age-related traits and prospective disease outcomes.
Retinal contextAdjacent retina
Retinal age gap and systemic ageing
Model-derived retinal age gap was associated with age-related traits and prospective disease outcomes.
Retinal contextRetinal foundation model
Associations from retinal images cannot be transferred to iris morphology.
2026ReviewRetinal OCT biomarkers in early Alzheimer's disease
Lepoittevin et al. · BMJ Open OphthalmologyA systematic review of 22 studies found retinal structural and microvascular alterations but inconsistent directions and magnitudes.
Retinal contextAdjacent retina
Retinal OCT biomarkers in early Alzheimer's disease
A systematic review of 22 studies found retinal structural and microvascular alterations but inconsistent directions and magnitudes.
Retinal contextOCT / OCT-angiography
Non-specific measurements, small cross-sectional cohorts and acquisition confounders restrict clinical inference.
2025Meta-analysisAI-assisted retinal imaging for neurodegenerative disease
Ganji et al. · Photodiagnosis and Photodynamic TherapyA systematic review and meta-analysis found pooled diagnostic AUC around 0.73 across selected neurodegenerative diseases.
Retinal contextAdjacent retina
AI-assisted retinal imaging for neurodegenerative disease
A systematic review and meta-analysis found pooled diagnostic AUC around 0.73 across selected neurodegenerative diseases.
Retinal contextFundus / OCT / machine learning
Moderate accuracy, heterogeneous models and possible selection bias; not ready as a stand-alone diagnostic.
2025ModelIris crypt permeability and angle closure: finite-element modelling
Tan et al. · Investigative Ophthalmology & Visual ScienceSimulations suggested that iris crypts can preserve anterior-chamber angle width during dilation under conditions of reduced tissue permeability.
BiomechanicsDirect iris
Iris crypt permeability and angle closure: finite-element modelling
Simulations suggested that iris crypts can preserve anterior-chamber angle width during dilation under conditions of reduced tissue permeability.
BiomechanicsHuman iris permeability / anterior-segment OCT / finite-element modelling
Computational predictions are mechanistic hypotheses, not prospective patient outcomes.
2025ReviewStructural and molecular retinal biomarkers in cognitive impairment
Min et al. · Alzheimer's & DementiaReviews structural, functional and molecular retinal candidates for cognitive-impairment research.
Retinal contextAdjacent retina
Structural and molecular retinal biomarkers in cognitive impairment
Reviews structural, functional and molecular retinal candidates for cognitive-impairment research.
Retinal contextMultimodal retinal measures
Candidate biomarkers need biomarker-confirmed longitudinal validation and differential-diagnosis testing.
2024OriginalDynamic iris-volume change and future angle closure
Study authors · British Journal of OphthalmologySmaller iris volume loss during physiological dilation was associated with greater risk of angle-closure progression.
Clinical anatomyDirect iris
Dynamic iris-volume change and future angle closure
Smaller iris volume loss during physiological dilation was associated with greater risk of angle-closure progression.
Clinical anatomyIris volume by anterior-segment OCT / preventive trial cohort
Related to ocular anatomy and angle closure, not non-ocular health assessment.
2023OriginalExploratory iris-image classification of coronary artery disease
Özbilgin et al. · DiagnosticsA single small study of 198 participants reported 93% classification accuracy.
Clinical associationExploratory iris
Exploratory iris-image classification of coronary artery disease
A single small study of 198 participants reported 93% classification accuracy.
Clinical associationIris images / SVM
Small single-study result; independent prospective replication and external validation are required. This does not validate iridology.
2022OriginalEye-colour genetics in a Canadian cohort
Study authors · Genome Biology and EvolutionIn 5,641 participants, HERC2–OCA2 signals were associated with eye colour and explored alongside melanocyte expression data.
Pigmentation geneticsDirect iris
Eye-colour genetics in a Canadian cohort
In 5,641 participants, HERC2–OCA2 signals were associated with eye colour and explored alongside melanocyte expression data.
Pigmentation geneticsGWAS / melanocyte molecular profiles
Results are largely based on European-ancestry cohorts.
2022OriginalPoor glycaemic control from external-eye photographs
Nature Biomedical EngineeringPhotographs of the anterior external eye provided a signal for HbA1c ≥9% across validation sets.
External-eye contextAdjacent external eye
Poor glycaemic control from external-eye photographs
Photographs of the anterior external eye provided a signal for HbA1c ≥9% across validation sets.
External-eye contextExternal-eye photography / AI
External-eye models do not validate claims about iris microstructures.
2021OriginalGenome-wide architecture of human eye colour
Simcoe et al. · Science AdvancesA study of up to 192,986 European participants found 124 independent associations across 61 genomic regions.
GeneticsDirect iris
Genome-wide architecture of human eye colour
A study of up to 192,986 European participants found 124 independent associations across 61 genomic regions.
GeneticsGWAS / eye colour
An eye-colour GWAS is not a validated marker of systemic disease.
2021OriginalIris surface features and corneal biomechanics in myopic eyes
Fu et al. · Journal of OphthalmologyCrypt and furrow grades were associated with selected corneal biomechanical measures in myopic eyes.
Ocular biomechanicsDirect iris
Iris surface features and corneal biomechanics in myopic eyes
Crypt and furrow grades were associated with selected corneal biomechanical measures in myopic eyes.
Ocular biomechanicsSlit-lamp iris images / Corvis ST
Cross-sectional association cannot determine causality or generalise beyond this sample.
2020OriginalRetinal vessel calibre and cardiometabolic risk
Cheung et al. · Nature Biomedical EngineeringAutomated vessel-calibre measures correlated with established cardiometabolic risk factors.
Retinal contextAdjacent retina
Retinal vessel calibre and cardiometabolic risk
Automated vessel-calibre measures correlated with established cardiometabolic risk factors.
Retinal contextRetinal vessel segmentation
Different anatomy and image acquisition from iris structural photography.
2019OriginalGenome-wide association of iris colour in South Asian ancestry
Study authors · Molecular Biology and EvolutionSLC24A5 and HERC2 variants showed associations with skin and iris pigmentation, highlighting the need for diverse ancestry sampling.
Pigmentation geneticsDirect iris
Genome-wide association of iris colour in South Asian ancestry
SLC24A5 and HERC2 variants showed associations with skin and iris pigmentation, highlighting the need for diverse ancestry sampling.
Pigmentation geneticsQuantitative iris colour / GWAS
Several novel findings lacked independent replication.
2018OriginalCardiovascular risk factors inferred from retinal fundus photographs
Poplin et al. · Nature Biomedical EngineeringRetinal images enabled prediction of several cardiovascular risk factors; reported major-event AUC was approximately 0.70.
Retinal contextAdjacent retina
Cardiovascular risk factors inferred from retinal fundus photographs
Retinal images enabled prediction of several cardiovascular risk factors; reported major-event AUC was approximately 0.70.
Retinal contextRetinal fundus photography / AI
Retinal fundus evidence is not evidence about iris texture or iris-zone maps.
2017MethodsAutomated OCT detection of iris furrows during dilation
Chua et al. · Scientific ReportsAn algorithm quantified furrow length and related it to dynamic iris-volume changes across dark and illuminated conditions.
Quantitative imagingDirect iris
Automated OCT detection of iris furrows during dilation
An algorithm quantified furrow length and related it to dynamic iris-volume changes across dark and illuminated conditions.
Quantitative imagingSwept-source OCT / automatic furrow extraction
Results came from a 65-person study and require cross-device replication.
2016OriginalCrypt grade and iris-volume loss on physiological dilation
Tun et al. · OphthalmologyAmong 65 adults, higher crypt grade was associated with greater loss of iris volume as the pupil dilated.
Ocular biomechanicsDirect iris
Crypt grade and iris-volume loss on physiological dilation
Among 65 adults, higher crypt grade was associated with greater loss of iris volume as the pupil dilated.
Ocular biomechanicsSlit-lamp iris grading / light–dark SS-OCT
Small cohort, specific ancestry and observational design limit generality.
2016OriginalIris surface features and structural geometry
Tun et al. · British Journal of OphthalmologyCrypt grade, pigmentation and contraction furrows were associated with iris volume or curvature in 1,704 participants.
MorphometryDirect iris
Iris surface features and structural geometry
Crypt grade, pigmentation and contraction furrows were associated with iris volume or curvature in 1,704 participants.
MorphometryAnterior-segment OCT
Population- and device-specific observational associations.
2016OriginalPopulation variation in visible iris surface features
Edwards et al. · Royal Society Open ScienceCrypts, nodules, pigment spots and contraction furrows showed differing frequencies across three ancestry groups.
MorphometryDirect iris
Population variation in visible iris surface features
Crypts, nodules, pigment spots and contraction furrows showed differing frequencies across three ancestry groups.
MorphometryClinical iris photography
Population differences require careful sampling and adjustment in computer-vision datasets.
2014OriginalIris crypts and anterior-chamber angle width
Sidhartha et al. · Investigative Ophthalmology & Visual ScienceHigher crypt grade and lighter iris colour were associated with a wider anterior chamber angle in a population-based Asian sample.
Clinical anatomyDirect iris
Iris crypts and anterior-chamber angle width
Higher crypt grade and lighter iris colour were associated with a wider anterior chamber angle in a population-based Asian sample.
Clinical anatomyIris photographic grading / anterior-segment OCT
Risk associations are not clinical diagnostic thresholds.
2014MethodsIrisPlex: collaborative external validation for eye-colour prediction
Study authors · Forensic Science International: GeneticsA multi-laboratory exercise evaluated DNA-based prediction of blue and brown eye colour; intermediate colours were less accurate.
Pigmentation geneticsDirect iris
IrisPlex: collaborative external validation for eye-colour prediction
A multi-laboratory exercise evaluated DNA-based prediction of blue and brown eye colour; intermediate colours were less accurate.
Pigmentation geneticsDNA genotyping / predicted eye colour
Predicting eye colour from DNA is not predicting disease from iris photographs.
2014MethodsReproducible grading of iris crypts and contraction furrows
Sidhartha et al. · OphthalmologyIntergrader weighted kappa values of 0.775 for crypts and 0.836 for furrows indicate reproducible visual grading.
MorphometryDirect iris
Reproducible grading of iris crypts and contraction furrows
Intergrader weighted kappa values of 0.775 for crypts and 0.836 for furrows indicate reproducible visual grading.
MorphometryStandardised photographic grading
Reproducibility of feature scoring does not establish systemic clinical utility.
2014OriginalRetinal calibre in the Tromsø Eye Study
von Hanno et al. · Acta OphthalmologicaAmong 6,353 participants, retinal vessel calibre associated with blood pressure and metabolic risk factors.
Retinal contextAdjacent retina
Retinal calibre in the Tromsø Eye Study
Among 6,353 participants, retinal vessel calibre associated with blood pressure and metabolic risk factors.
Retinal contextRetinal vessel imaging
Associations are in retinal vasculature, not visible iris patterns.
2013OriginalEye-colour genetics across Silk Road populations
Study authors · Scientific ReportsAssociations with HERC2, OCA2 and CTNNA2 were reported across sampled populations.
Pigmentation geneticsDirect iris
Eye-colour genetics across Silk Road populations
Associations with HERC2, OCA2 and CTNNA2 were reported across sampled populations.
Pigmentation geneticsIris colour phenotyping / GWAS
Ancestry and population structure affect effect-size interpretation.
2013OriginalGenetic architecture of skin and eye pigmentation in Cape Verde
Beleza et al. · PLOS GeneticsHERC2–OCA2 and SLC24A5 were associated with eye-colour variation in an admixed cohort of 699 participants.
Pigmentation geneticsDirect iris
Genetic architecture of skin and eye pigmentation in Cape Verde
HERC2–OCA2 and SLC24A5 were associated with eye-colour variation in an admixed cohort of 699 participants.
Pigmentation geneticsQuantitative iris colour / GWAS
Pigment genetics does not support disease inference from iris-zone markings.
2011OriginalGenetic associations with crypts, furrows and pigmented rings
Larsson et al. · American Journal of Human GeneticsSEMA3A, TRAF3IP1 and SLC24A4 variants were associated with distinct iris texture traits across discovery and replication samples.
GeneticsDirect iris
Genetic associations with crypts, furrows and pigmented rings
SEMA3A, TRAF3IP1 and SLC24A4 variants were associated with distinct iris texture traits across discovery and replication samples.
GeneticsIris photography / GWAS
Genetic association explains a small fraction of trait variation; no organ-zone or disease inference.
2011OriginalIris texture, colour and genetic ancestry
Quillen et al. · American Journal of Human BiologyIn a 300-person sample, pigmentation spots, crypts, furrows and iris colour showed associations with genomic ancestry.
GeneticsDirect iris
Iris texture, colour and genetic ancestry
In a 300-person sample, pigmentation spots, crypts, furrows and iris colour showed associations with genomic ancestry.
GeneticsIris photography / ancestry markers
Population-level correlation cannot identify an individual's ancestry or health from a photograph.
2008OriginalHERC2 as a major genetic determinant of human iris colour
Kayser et al. · American Journal of Human GeneticsMultiple genome-wide studies linked the HERC2 locus and neighbouring OCA2 regulation to iris-colour variation.
Pigmentation geneticsDirect iris
HERC2 as a major genetic determinant of human iris colour
Multiple genome-wide studies linked the HERC2 locus and neighbouring OCA2 regulation to iris-colour variation.
Pigmentation geneticsGWAS and family linkage
Colour inheritance is polygenic; results do not infer neurological or systemic disease.
2005OriginalBlinded case-control test of cancer diagnosis through iridology
Study authors · Journal of Alternative and Complementary MedicineIridology achieved a sensitivity of 0.04 in identifying the investigated cancers.
Evidence boundaryClinical validation
Blinded case-control test of cancer diagnosis through iridology
Iridology achieved a sensitivity of 0.04 in identifying the investigated cancers.
Evidence boundaryBlinded iris reading / clinically defined cancer status
Disease-specific diagnostic study; does not invalidate quantitative ophthalmic imaging.
2004OriginalCandidate-gene associations with human iris pigmentation
Frudakis et al. · GeneticsMultiple pigmentation-related genetic variants were linked with observed iris-colour differences.
Pigmentation geneticsDirect iris
Candidate-gene associations with human iris pigmentation
Multiple pigmentation-related genetic variants were linked with observed iris-colour differences.
Pigmentation geneticsIris phenotype / SNP and haplotype analysis
Early candidate-gene associations require population-aware replication.
2004OriginalGenetic correlations among iris texture characteristics
Larsson & Pedersen · Molecular VisionGenetic correlations between crypts, pigment dots, Wolfflin nodules, furrows and colour were generally modest.
GeneticsDirect iris
Genetic correlations among iris texture characteristics
Genetic correlations between crypts, pigment dots, Wolfflin nodules, furrows and colour were generally modest.
GeneticsTwin-image quantitative texture scoring
Related appearance traits can have substantially distinct genetic influences.
2003OriginalHeritability of human iris texture in a twin cohort
Larsson et al. · Twin ResearchIn twin data, estimated heritability ranged from 0.51 to 0.90 across five iris texture traits, including crypt frequency and contraction furrows.
GeneticsDirect iris
Heritability of human iris texture in a twin cohort
In twin data, estimated heritability ranged from 0.51 to 0.90 across five iris texture traits, including crypt frequency and contraction furrows.
GeneticsStandardised iris photography / twin modelling
Heritability is population-dependent and does not imply medical diagnostic value.
1999ReviewSystematic review testing diagnostic claims of iridology
Ernst · Forschende KomplementärmedizinA review of four case-control studies concluded that iridology did not have evidence supporting diagnostic validity.
Evidence boundaryClinical validation
Systematic review testing diagnostic claims of iridology
A review of four case-control studies concluded that iridology did not have evidence supporting diagnostic validity.
Evidence boundaryBlinded diagnostic validity studies
Historical small studies; should not be confused with modern iris anatomy or biometrics research.
1979OriginalBlinded evaluation of kidney-disease diagnosis by iridology
Simon et al. · JAMAIris-pattern interpretation did not discriminate patients with kidney disease better than chance in 143 participants.
Evidence boundaryClinical validation
Blinded evaluation of kidney-disease diagnosis by iridology
Iris-pattern interpretation did not discriminate patients with kidney disease better than chance in 143 participants.
Evidence boundaryRandomised, blinded iris-photo assessment / kidney laboratory testing
Assesses traditional diagnostic iridology, not contemporary retinal biomarkers.
Pupillometry
Light reflex, melanopsin, autonomic physiology, cognition and neurodegeneration. The light-stimulus protocol, device and clinical population determine interpretability.
2026MethodsBenchmark of pupillary light-reflex latency estimators
Study authors · Scientific ReportsLatency error varied across threshold, derivative, piecewise linear and Bergamin–Kardon estimation, especially under noise.
Signal processingEngineering validation
Benchmark of pupillary light-reflex latency estimators
Latency error varied across threshold, derivative, piecewise linear and Bergamin–Kardon estimation, especially under noise.
Signal processingSynthetic light-reflex curves / five latency algorithms
Synthetic benchmarking does not replace calibration against timestamped hardware measurements.
2026OriginalCognitive pupil response in Alzheimer's versus frontotemporal dementia
El Haj et al. · Alzheimer Disease & Associated DisordersThe report found smaller task pupil diameters in bvFTD than AD, and AD than controls.
NeurodegenerationClinical evidence
Cognitive pupil response in Alzheimer's versus frontotemporal dementia
The report found smaller task pupil diameters in bvFTD than AD, and AD than controls.
NeurodegenerationPupil diameter during subtraction / counting
Group-level exploratory differences are not diagnostic cut-offs.
2026Meta-analysisMeta-analysis of light-reflex metrics in glaucoma
Moniritilaki et al. · Ophthalmology ScienceConstriction amplitude, latency, velocity and post-illumination responses were affected across glaucoma studies; protocol conditions influenced effect sizes.
Ocular diseaseClinical evidence
Meta-analysis of light-reflex metrics in glaucoma
Constriction amplitude, latency, velocity and post-illumination responses were affected across glaucoma studies; protocol conditions influenced effect sizes.
Ocular diseaseChromatic and achromatic PLR protocols
No universal device-independent diagnostic cut-offs are established.
2026OriginalMobile eye-tracker pupil responses during walking in Parkinson's
Study authors · Gait and clinical movement studyIn 38 Parkinson's participants and 16 controls, pupil velocity, size and asymmetry differed during walking.
NeurodegenerationClinical evidence
Mobile eye-tracker pupil responses during walking in Parkinson's
In 38 Parkinson's participants and 16 controls, pupil velocity, size and asymmetry differed during walking.
Neurodegeneration100-Hz eye-tracking glasses / gait sensors
Exploratory mobile study; locomotion, pupil size and illumination are confounded.
2026OriginalProspective smartphone light-response validation (PLR-V)
Schmidt et al. · Anaesthesia and Intensive CareAmong 66 healthy participants, baseline diameter agreement and repeatability were encouraging, but some constriction metrics differed.
Mobile measurementEngineering validation
Prospective smartphone light-response validation (PLR-V)
Among 66 healthy participants, baseline diameter agreement and repeatability were encouraging, but some constriction metrics differed.
Mobile measurementMindMirror smartphone / NeurOptics NPi-200
Healthy volunteer cohort, collection conditions and declared industry involvement limit interpretation.
2026OriginalPupillary change alongside diabetic retinal microvascular damage
Study authors · Diabetes-related ophthalmic studyStatic pupil differences appeared in people with diabetes, with stronger dynamic abnormalities in those with retinopathy.
Metabolic autonomicClinical evidence
Pupillary change alongside diabetic retinal microvascular damage
Static pupil differences appeared in people with diabetes, with stronger dynamic abnormalities in those with retinopathy.
Metabolic autonomicQuantitative PLR / OCT / OCTA
Cross-sectional co-associations cannot establish screening performance or causality.
2026OriginalPupillary working-memory signatures adapt to task goals
Dong et al. · iSciencePupil responses reflected remembered scene brightness when participants maintained visual rather than semantic information.
CognitionFoundational
Pupillary working-memory signatures adapt to task goals
Pupil responses reflected remembered scene brightness when participants maintained visual rather than semantic information.
CognitionScene brightness recall / task-evoked pupil diameter
Task-evoked pupil size is context-dependent and not uniquely diagnostic of memory impairment.
2026OriginalPupillography-based machine learning in multiple sclerosis
Study authors · Multiple Sclerosis and Related DisordersA model's ROC AUC fell from 0.945 on a test set to 0.627 on independent validation, illustrating generalisation limits.
NeurodegenerationExploratory clinical ML
Pupillography-based machine learning in multiple sclerosis
A model's ROC AUC fell from 0.945 on a test set to 0.627 on independent validation, illustrating generalisation limits.
NeurodegenerationPupil size / symmetry / PLR features / random forest
Small patient samples and poor external specificity preclude screening claims.
2026OriginalVestibular migraine and quantitative pupil measurements: a negative study
Uysal et al. · Journal of Oral & Facial Pain and HeadacheIn 40 patients and 30 controls, most static and dynamic pupillary measures showed no meaningful between-group differences.
Autonomic physiologyClinical evidence
Vestibular migraine and quantitative pupil measurements: a negative study
In 40 patients and 30 controls, most static and dynamic pupillary measures showed no meaningful between-group differences.
Autonomic physiologyInfrared pupil recording under five illumination conditions
Single-centre interictal findings cannot exclude disease-stage-dependent effects.
2025OriginalA smartphone pupillometry prototype that failed quantitative validation
Tan et al. · MedicineThe application frequently failed image capture and systematically underestimated constriction relative to clinical methods.
Mobile measurementEngineering validation
A smartphone pupillometry prototype that failed quantitative validation
The application frequently failed image capture and systematically underestimated constriction relative to clinical methods.
Mobile measurementSmartphone light-response app / penlight / commercial pupil tracker
Shows why successful software tracking alone is insufficient for measurement validity.
2025OriginalAutonomic involvement in Parkinson's disease measured by pupil response
İşcan et al. · Neurological SciencesEvaluates pupillary measures as candidate indicators of autonomic dysfunction in Parkinson's disease.
NeurodegenerationClinical evidence
Autonomic involvement in Parkinson's disease measured by pupil response
Evaluates pupillary measures as candidate indicators of autonomic dysfunction in Parkinson's disease.
NeurodegenerationQuantitative pupillometry
Observational autonomic measures require protocol standardisation and replication.
2025OriginalDoctorPupil: virtual-reality task-evoked responses in Parkinson's disease
Zhang et al. · IEEE Journal of Biomedical and Health InformaticsA 55-person experiment reported exploratory classification of early Parkinson's disease using pupil-response patterns.
NeurodegenerationClinical evidence
DoctorPupil: virtual-reality task-evoked responses in Parkinson's disease
A 55-person experiment reported exploratory classification of early Parkinson's disease using pupil-response patterns.
NeurodegenerationVirtual reality / pupillary light reflex / cognitive pupil response
Small developmental study; reported accuracy needs independent, clinically representative validation.
2025OriginalHandheld monocular pupillometer validation in autonomic failure
Sander et al. · European Journal of NeurologyA prospective study of 40 controls and 100 patients reported reproducible light-response measurements and differences across autonomic-disorder groups.
Autonomic physiologyClinical evidence
Handheld monocular pupillometer validation in autonomic failure
A prospective study of 40 controls and 100 patients reported reproducible light-response measurements and differences across autonomic-disorder groups.
Autonomic physiologyPLR-4000 / apraclonidine / test–retest / binocular comparator
Disease groups and pharmacological testing cannot be substituted by a phone-camera protocol.
2025OriginalNon-injury covariates of pupil light reflex after mild TBI
Study authors · Brain InjuryA 216-person study found no overall between-group light-reflex differences but links with age, sleep and injury history.
Clinical monitoringClinical evidence
Non-injury covariates of pupil light reflex after mild TBI
A 216-person study found no overall between-group light-reflex differences but links with age, sleep and injury history.
Clinical monitoringNPi-300 / military cohort / multivariable regression
Negative result highlights confounding and limited specificity for mTBI screening.
2025OriginalPrognostic value of light-reflex pupillometry in early Alzheimer's
Gramkow et al. · Alzheimer's Research & TherapyLongitudinal measurements were assessed for associations with clinical progression and imaging outcomes.
NeurodegenerationClinical evidence
Prognostic value of light-reflex pupillometry in early Alzheimer's
Longitudinal measurements were assessed for associations with clinical progression and imaging outcomes.
NeurodegenerationRepeated quantitative light-reflex tests
Prognostic performance must be interpreted within the cohort and independently validated.
2025Meta-analysisPupillary light reflex in Parkinson's disease: systematic review
Dawidziuk et al. · DiagnosticsAcross 31 reviewed papers (11 pooled), Parkinson's groups had reduced maximum constriction velocity and amplitude and longer latency.
NeurodegenerationClinical evidence
Pupillary light reflex in Parkinson's disease: systematic review
Across 31 reviewed papers (11 pooled), Parkinson's groups had reduced maximum constriction velocity and amplitude and longer latency.
NeurodegenerationLight-reflex pupillometry
Protocol heterogeneity and differing disease stages limit clinical thresholds.
2025MethodsRapid chromatic pupillometry: age and test–retest repeatability
Study authors · Documenta OphthalmologicaIn 37 healthy participants, a short dark-adaptation protocol enabled repeatable maximum constriction and PIPR measurements.
Measurement protocolsEngineering validation
Rapid chromatic pupillometry: age and test–retest repeatability
In 37 healthy participants, a short dark-adaptation protocol enabled repeatable maximum constriction and PIPR measurements.
Measurement protocols470- and 621-nm pulses / dark adaptation
Reliability is specific to calibrated wavelengths, stimulus intensity and equipment.
2025OriginalTask-evoked pupil response and cognitive load in ALS
El Haj et al. · eNeurologicalSciIn three patients with ALS and 16 controls, both groups showed pupil dilation with increasing task demands without significant group differences.
NeurodegenerationClinical evidence
Task-evoked pupil response and cognitive load in ALS
In three patients with ALS and 16 controls, both groups showed pupil dilation with increasing task demands without significant group differences.
NeurodegenerationForward/backward digit span / pupillometry
Extremely small ALS sample prohibits population-level or diagnostic conclusions.
2024OriginalA conserved pupillary contrast response in mice and humans
Fitzpatrick et al. · NeuronDescribed pupil constriction to temporal contrast and implicated rod, bipolar-cell and M1 ganglion-cell circuitry.
Visual physiologyFoundational
A conserved pupillary contrast response in mice and humans
Described pupil constriction to temporal contrast and implicated rod, bipolar-cell and M1 ganglion-cell circuitry.
Visual physiologyTemporal contrast / photoreceptor circuitry / modelling
Some circuit-level experiments used mice; cross-species inference requires care.
2024ReviewClinical uses and interpretation of quantitative pupillometry
Figueroa et al. · American Journal of MedicineReviews neurological and general-medical uses of automated rather than subjective pupil examination.
Clinical monitoringClinical evidence
Clinical uses and interpretation of quantitative pupillometry
Reviews neurological and general-medical uses of automated rather than subjective pupil examination.
Clinical monitoringClinical quantitative light-reflex devices
Clinical neuromonitoring is not proof of disease-specific community screening.
2024OriginalPoor cross-device agreement for smartphone and clinical pupillometers
Rattan et al. · International Journal of Applied and Basic Medical ResearchIn 100 healthy participants, agreement for most metrics was poor, showing that phone and medical-device readings were not interchangeable.
Mobile measurementEngineering validation
Poor cross-device agreement for smartphone and clinical pupillometers
In 100 healthy participants, agreement for most metrics was poor, showing that phone and medical-device readings were not interchangeable.
Mobile measurementSmartphone pupillometry / NPi-200
Findings apply to the tested application and device combination.
2024ReviewPupil dynamics across working-memory operations
Koevoet et al. · WIREs Cognitive ScienceReviews pupil changes during encoding, maintenance and prioritisation in visual working memory.
CognitionFoundational
Pupil dynamics across working-memory operations
Reviews pupil changes during encoding, maintenance and prioritisation in visual working memory.
CognitionTask-evoked pupillometry
Pupil changes are not specific to one cognitive process or disorder.
2024OriginalQuantitative light-reflex pupillometry in dementia
Gramkow et al. · Alzheimer's & Dementia: Diagnosis, Assessment & Disease MonitoringIn 254 participants, models separating Alzheimer's disease from controls and other dementias reported AUROCs of 0.74–0.81.
NeurodegenerationClinical evidence
Quantitative light-reflex pupillometry in dementia
In 254 participants, models separating Alzheimer's disease from controls and other dementias reported AUROCs of 0.74–0.81.
NeurodegenerationHandheld light-reflex pupillometry
Proof of concept, not an independent diagnostic test.
2024OriginalTask-evoked dilation in mild cognitive impairment
Opwonya et al. · Alzheimer's & Dementia: Diagnosis, Assessment & Disease MonitoringAmong 727 participants, those with MCI showed reduced dilation during cue and target-onset periods.
CognitionClinical evidence
Task-evoked dilation in mild cognitive impairment
Among 727 participants, those with MCI showed reduced dilation during cue and target-onset periods.
CognitionOculomotor tasks / task-evoked pupil
Task, illumination and cognitive-performance confounds must be controlled.
2023MethodsFar-red illumination for smartphone pupil detection across iris colours
Barry & Wang · Scientific ReportsFar-red imaging improved pupil–iris contrast across four smartphone models and produced promising relative-diameter estimates in a small validation sample.
Mobile measurementEngineering validation
Far-red illumination for smartphone pupil detection across iris colours
Far-red imaging improved pupil–iris contrast across four smartphone models and produced promising relative-diameter estimates in a small validation sample.
Mobile measurementRGB phone camera / far-red optical filter / deep learning
Requires an added optical filter and validation beyond 11 reference-comparison participants.
2023MethodsMethods and open questions in cognitive pupillometry
Mathôt & Vilotijević · Behavior Research MethodsExperimental design, luminance management, blinking and preprocessing affect reproducibility.
MeasurementFoundational
Methods and open questions in cognitive pupillometry
Experimental design, luminance management, blinking and preprocessing affect reproducibility.
MeasurementCognitive pupillometry protocols
Non-standardised preprocessing can create incompatible effect estimates.
2023ReviewPupil response during cognitive tasks in dementia and MCI
Zeeman et al. · American Journal of Alzheimer's Disease & Other DementiasA scoping review of eight studies found differences in cognitive-task pupil responses; MCI findings were less consistent.
CognitionClinical evidence
Pupil response during cognitive tasks in dementia and MCI
A scoping review of eight studies found differences in cognitive-task pupil responses; MCI findings were less consistent.
CognitionTask-evoked pupillometry
Small and heterogeneous evidence base.
2023ReviewPupil size as a measure of arousal and neuromodulation
Viglione et al. · Frontiers in Neural CircuitsReviews relationships between pupil variation, attention and the locus-coeruleus noradrenergic system.
PhysiologyFoundational
Pupil size as a measure of arousal and neuromodulation
Reviews relationships between pupil variation, attention and the locus-coeruleus noradrenergic system.
PhysiologyArousal / LC–NE dynamics
Pupil diameter is influenced by multiple pathways; it is not a unique readout of LC activity.
2022OriginalSmartphone infrared pupillography: pilot technical assessment
Study authors · Journal of Neuro-OphthalmologyA pilot study found high inter-rater agreement for image-based pupil measurements.
Mobile measurementEngineering validation
Smartphone infrared pupillography: pilot technical assessment
A pilot study found high inter-rater agreement for image-based pupil measurements.
Mobile measurementPhone-based infrared pupil video
Small feasibility study; results do not validate a broad clinical test.
2021MethodsSmartphone pupil measurement compared with a commercial device
Neice et al. · Journal of Clinical Monitoring and ComputingThe prototype identified the iris and pupil in 77% of scans; pupil unrest measurements had useful agreement in selected conditions.
Mobile measurementEngineering validation
Smartphone pupil measurement compared with a commercial device
The prototype identified the iris and pupil in 77% of scans; pupil unrest measurements had useful agreement in selected conditions.
Mobile measurementSmartphone pupil video / commercial pupillometer
Image-acquisition failures limit readiness across users, eyes and lighting environments.
2019OriginalMelanopsin and cone inputs to the human pupil
Zele et al. · Frontiers in NeurologyMelanopsin-driven components showed a slower and more sustained response than cone-mediated inputs.
PhysiologyFoundational
Melanopsin and cone inputs to the human pupil
Melanopsin-driven components showed a slower and more sustained response than cone-mediated inputs.
PhysiologySilent-substitution stimulation
Specialist spectral stimulation is not equivalent to ordinary phone-screen flashes.
2018OriginaliPhone-based pupillary light-reflex assessment
Study authors · Translational Vision Science & TechnologyReported correlation of 0.91 for light response across tested methods, with nonzero limits of agreement.
Mobile measurementEngineering validation
iPhone-based pupillary light-reflex assessment
Reported correlation of 0.91 for light response across tested methods, with nonzero limits of agreement.
Mobile measurementSmartphone screen stimulation / infrared camera comparison
Device and stimulation settings need independent calibration.
2016OriginalChromatic pupil responses and circadian status
Bonmati-Carrion et al. · PLOS ONEInvestigated correlations between wavelength-dependent pupil responses and circadian measures.
PhysiologyFoundational
Chromatic pupil responses and circadian status
Investigated correlations between wavelength-dependent pupil responses and circadian measures.
PhysiologyMonochromatic pupil stimulation
Small healthy sample and correlational design limit generalisation.
2015OriginalTemporal characteristics of melanopsin-mediated pupil response
Zele and colleagues · Vision ResearchPost-illumination pupil dynamics reflect distinctive sustained melanopsin inputs.
PhysiologyFoundational
Temporal characteristics of melanopsin-mediated pupil response
Post-illumination pupil dynamics reflect distinctive sustained melanopsin inputs.
PhysiologyChromatic light pulses
Stimulus wavelength, intensity and adaptation must be recorded.
2015MethodsTest–retest reliability of chromatic pupillometry
Lei et al. · Investigative Ophthalmology & Visual ScienceBlue-light PIPR measures showed intraclass correlations of approximately 0.87–0.95 under tested field conditions.
MeasurementFoundational
Test–retest reliability of chromatic pupillometry
Blue-light PIPR measures showed intraclass correlations of approximately 0.87–0.95 under tested field conditions.
MeasurementChromatic PIPR / test–retest
Reliability is tied to equipment and specific stimulation protocols.
2012OriginalPost-illumination pupillary response in diabetes
Feigl et al. · Acta OphthalmologicaInvestigates melanopsin-linked pupil responses in people with diabetes.
Autonomic and metabolicClinical evidence
Post-illumination pupillary response in diabetes
Investigates melanopsin-linked pupil responses in people with diabetes.
Autonomic and metabolicChromatic post-illumination pupil response
A disease-associated difference does not by itself establish a screening test.
2010OriginalRod, cone and melanopsin contributions to the light reflex
McDougal & Gamlin · Vision ResearchRods, cones and melanopsin-expressing ganglion cells contribute differently to sustained pupil constriction.
PhysiologyFoundational
Rod, cone and melanopsin contributions to the light reflex
Rods, cones and melanopsin-expressing ganglion cells contribute differently to sustained pupil constriction.
PhysiologyControlled spectral stimulation
Spectral-response findings require calibrated illumination to reproduce.
2003MethodsHow sampling rate changes pupillary light-reflex latency estimates
Bergamin & Kardon · Investigative Ophthalmology & Visual ScienceLatency estimation was influenced by recording frequency, stimulus strength and signal-averaging method.
Signal processingFoundational
How sampling rate changes pupillary light-reflex latency estimates
Latency estimation was influenced by recording frequency, stimulus strength and signal-averaging method.
Signal processing60-Hz versus 1,000-Hz recordings
Method-dependent errors make cross-study latency comparisons difficult.
Morphogenesis
Optic-cup development, neural crest migration, genetic regulation and pattern-formation theory. Conceptual mathematical models are distinguished from experimentally supported iris development.
2026ReviewAnterior-segment dysgenesis with glaucoma: current genetics
Saha et al. · European Journal of OphthalmologyContemporary synthesis of PAX6, FOXC1, PITX2 and associated genes in anterior-segment abnormalities.
Developmental geneticsDevelopmental evidence
Anterior-segment dysgenesis with glaucoma: current genetics
Contemporary synthesis of PAX6, FOXC1, PITX2 and associated genes in anterior-segment abnormalities.
Developmental geneticsReview of developmental disorders
This is a clinical developmental-disorder review, not a validation of iris-derived systemic biomarkers.
2026OriginalPilot PAX6 gene-augmentation experiment in aniridia mice
Djaksigulova et al. · Gene TherapyA small proof-of-concept study reported retinal-ganglion-cell-layer changes and altered Notch1 transcription.
Developmental geneticsPreclinical
Pilot PAX6 gene-augmentation experiment in aniridia mice
A small proof-of-concept study reported retinal-ganglion-cell-layer changes and altered Notch1 transcription.
Developmental geneticsIntravenous rAAV-PAX6 in Sey mouse model
Mouse preclinical therapy, not human treatment evidence or iris regrowth.
2025OriginalCdc42 controls polarity and optic-cup morphogenesis
Study authors · Developmental biology studyLoss of Cdc42 disrupted optic-cup folding, actin-related junctional organisation and ventral eye development.
Tissue mechanicsPreclinical
Cdc42 controls polarity and optic-cup morphogenesis
Loss of Cdc42 disrupted optic-cup folding, actin-related junctional organisation and ventral eye development.
Tissue mechanicsConditional Cdc42 mouse model / cell polarity proteins
Mouse developmental defect is mechanistic evidence and not a model of ordinary iris pattern.
2025OriginalPatient-derived optic-cup organoids reveal PAX6/Notch disruption
Harding et al. · Biochimica et Biophysica Acta - Molecular Basis of DiseaseTwo PAX6 variant classes caused distinct disruptions involving SOX2 and Notch signalling in early eye development.
Developmental geneticsPreclinical
Patient-derived optic-cup organoids reveal PAX6/Notch disruption
Two PAX6 variant classes caused distinct disruptions involving SOX2 and Notch signalling in early eye development.
Developmental geneticsPatient hiPSC eye organoids / RNA-seq / ATAC-seq
Organoid models and rare variants do not directly model adult iris stromal patterns.
2024ReviewCongenital anterior-segment disorders: genotype and phenotype
Reis et al. · Progress in Retinal and Eye ResearchSurveys genes and developmental pathways behind aniridia, Axenfeld–Rieger anomalies and related conditions.
Developmental geneticsDevelopmental evidence
Congenital anterior-segment disorders: genotype and phenotype
Surveys genes and developmental pathways behind aniridia, Axenfeld–Rieger anomalies and related conditions.
Developmental geneticsAnterior-segment genetics
Disease-causing variants do not describe ordinary iris texture variability.
2024OriginalDeep mutational scanning of PAX6 DNA binding
McDonnell et al. · Molecular Systems BiologyHigh-throughput measurements quantified how paired-domain variants alter binding to specific regulatory sequences.
Developmental geneticsPreclinical
Deep mutational scanning of PAX6 DNA binding
High-throughput measurements quantified how paired-domain variants alter binding to specific regulatory sequences.
Developmental genetics2,700+ PAX6 variants / yeast one-hybrid assay
In vitro binding is a mechanistic proxy, not an entire developing eye.
2024OriginalGenotype–phenotype relationships in 164 families with PAX6 disease
Study authors · Investigative Ophthalmology & Visual ScienceAmong 228 patients, PAX6 variants were associated with foveal hypoplasia, nystagmus and variable iris hypoplasia.
Developmental geneticsHuman clinical genetics
Genotype–phenotype relationships in 164 families with PAX6 disease
Among 228 patients, PAX6 variants were associated with foveal hypoplasia, nystagmus and variable iris hypoplasia.
Developmental geneticsExome analysis / ocular phenotyping / family segregation
Referral cohorts are not representative of ordinary iris-pattern development.
2024OriginalNGS and copy-number screening in congenital aniridia
Study authors · Clinical genetics studyCombined methods detected pathogenic variants or deletions in nearly all of 60 studied patients, chiefly involving PAX6-related loci.
Developmental geneticsHuman clinical genetics
NGS and copy-number screening in congenital aniridia
Combined methods detected pathogenic variants or deletions in nearly all of 60 studied patients, chiefly involving PAX6-related loci.
Developmental geneticsTargeted sequencing / MLPA / anterior-segment examination
Study of congenital pathology rather than non-pathological iris pattern variation.
2024OriginalPAX6 haplotype deficiency and congenital aniridia phenotype
Study authors · Clinical ophthalmic geneticsFour PAX6 variants were identified in studied families, with prominent iris and foveal anomalies and variable associated defects.
Developmental geneticsHuman clinical genetics
PAX6 haplotype deficiency and congenital aniridia phenotype
Four PAX6 variants were identified in studied families, with prominent iris and foveal anomalies and variable associated defects.
Developmental geneticsFamily phenotype / targeted sequencing
Pathogenic aniridia variants cannot explain typical crypt or furrow variation.
2024OriginalWhole-genome sequencing in genetically unexplained aniridia
Study authors · Journal of Medical GeneticsLikely causal mutations were detected in 22 of 37 previously unresolved families, including structural and regulatory variants.
Developmental geneticsHuman clinical genetics
Whole-genome sequencing in genetically unexplained aniridia
Likely causal mutations were detected in 22 of 37 previously unresolved families, including structural and regulatory variants.
Developmental geneticsWhole-genome sequencing / regulatory variants
Findings focus on rare Mendelian ocular malformations.
2023ReviewEye morphogenesis in vertebrates
Casey, Lusk & Kwan · Annual Review of Vision ScienceSynthesises coordinated tissue shaping and three-dimensional assembly of ocular structures.
EmbryologyDevelopmental evidence
Eye morphogenesis in vertebrates
Synthesises coordinated tissue shaping and three-dimensional assembly of ocular structures.
EmbryologyVertebrate eye formation
Broader eye morphogenesis, not a validated iris-pattern simulator.
2023ReviewRetinal morphogenesis from optic cup to neuronal layers
Norden · Annual Review of Cell and Developmental BiologyReviews how cell-level movements and tissue reorganisation form retinal layers during ocular development.
EmbryologyDevelopmental evidence
Retinal morphogenesis from optic cup to neuronal layers
Reviews how cell-level movements and tissue reorganisation form retinal layers during ocular development.
EmbryologyNeuroepithelial cell movement / retinal differentiation
Reviews retina rather than direct emergence of human iris furrows.
2021ModelElastic instabilities as a model of optic-cup folding
Lee et al. · Physical Review LettersModel simulations linked optic-cup inversion and geometry changes to growth-induced elastic instabilities.
Tissue mechanicsConceptual analogy
Elastic instabilities as a model of optic-cup folding
Model simulations linked optic-cup inversion and geometry changes to growth-induced elastic instabilities.
Tissue mechanicsNonlinear finite-element shell mechanics
A mathematical model of optic-cup shape, not an empirical iris-crypt generator.
2021OriginalRetinal pigment epithelium stretching during optic-cup development
Study authors · eLifeFlattening of retinal pigment epithelial cells helped the optic vesicle fold in zebrafish development.
Tissue mechanicsPreclinical
Retinal pigment epithelium stretching during optic-cup development
Flattening of retinal pigment epithelial cells helped the optic vesicle fold in zebrafish development.
Tissue mechanicsZebrafish live imaging / cytoskeletal perturbations
Retina-specific and species-specific process, not confirmed iris texture morphogenesis.
2021ReviewTuring patterns in zebrafish skin: advances and biological constraints
Kondo · Philosophical Transactions of the Royal Society ACell migration and contact-dependent signalling can yield self-organised patterns beyond simple chemical diffusion.
Pattern theoryConceptual analogy
Turing patterns in zebrafish skin: advances and biological constraints
Cell migration and contact-dependent signalling can yield self-organised patterns beyond simple chemical diffusion.
Pattern theoryZebrafish pigment-cell interactions / mathematical models
Fish skin is an analogy; human iris patterning has not been shown to use this same mechanism.
2020ModelQuantitative cell-based modelling of zebrafish pigment stripes
Owen et al. · eLifeAn individual-based model reproduced wild-type and mutant zebrafish pigment distributions.
Pattern theoryConceptual analogy
Quantitative cell-based modelling of zebrafish pigment stripes
An individual-based model reproduced wild-type and mutant zebrafish pigment distributions.
Pattern theoryAgent-based pigment cell interactions / growth modelling
Pattern simulations from fish skin are not mechanistic validation of iris stromal texture.
2019ReviewNeural crest specification and rare ocular diseases
Akula, Park & West-Mays · Journal of Neuroscience ResearchReviews how migrating neural crest cells contribute to ocular structures and how regulatory genes govern differentiation.
Cell migrationDevelopmental evidence
Neural crest specification and rare ocular diseases
Reviews how migrating neural crest cells contribute to ocular structures and how regulatory genes govern differentiation.
Cell migrationNeural crest / migration
Broad anterior-segment biology; not iris-specific photographic inference.
2017OriginalFOXC1 and FOXC2 functions in ocular anterior-segment formation
Seo et al. · Investigative Ophthalmology & Visual ScienceExperimental loss of Foxc2 affected pupil position and iris shape, with disrupted anterior-segment development.
Developmental geneticsPreclinical
FOXC1 and FOXC2 functions in ocular anterior-segment formation
Experimental loss of Foxc2 affected pupil position and iris shape, with disrupted anterior-segment development.
Developmental geneticsNeural-crest genetic models
Transgenic findings require care when extrapolating to non-pathological human pattern variation.
2015ReviewIs fish pigmentation driven by Turing-type pattern formation?
Watanabe & Kondo · Trends in GeneticsReviews how short-range activation and long-range inhibition can arise from real pigment-cell interactions.
Pattern theoryConceptual analogy
Is fish pigmentation driven by Turing-type pattern formation?
Reviews how short-range activation and long-range inhibition can arise from real pigment-cell interactions.
Pattern theoryExperiments and models of zebrafish pigmentation
Biophysical analogy, not proof of chemical reaction–diffusion for the human iris.
2014ReviewGenetic regulation of vertebrate eye development
Zagozewski, Zhang & Eisenstat · Clinical GeneticsDescribes signalling and transcription factors that regionalise embryonic ocular tissues.
EmbryologyDevelopmental evidence
Genetic regulation of vertebrate eye development
Describes signalling and transcription factors that regionalise embryonic ocular tissues.
EmbryologyEye field / optic cup regulatory pathways
Much of the review concerns retina and optic cup, not iris surface patterns alone.
2014ReviewGenomics of anterior-segment dysgenesis
Ito & Walter · Clinical & Experimental OphthalmologyLinks PAX6, FOXC1 and PITX2 to heterogeneous abnormalities of anterior ocular development.
Developmental geneticsDevelopmental evidence
Genomics of anterior-segment dysgenesis
Links PAX6, FOXC1 and PITX2 to heterogeneous abnormalities of anterior ocular development.
Developmental geneticsClinical and genetic literature
Focuses on pathology rather than ordinary texture morphogenesis.
2014ModelPattern selection in reaction–diffusion systems
Marquez-Lago & Padilla · Theoretical Biology and Medical ModellingDerives a criterion for whether modelled reaction–diffusion systems produce spots or stripes.
Pattern theoryConceptual analogy
Pattern selection in reaction–diffusion systems
Derives a criterion for whether modelled reaction–diffusion systems produce spots or stripes.
Pattern theoryReaction–diffusion mathematical model
General mathematical pattern theory; not proof that this mechanism generates human iris crypts or furrows.
2011OriginalSelf-organising optic cups from 3D embryonic stem-cell culture
Eiraku et al. · NatureMouse stem-cell aggregates formed optic-cup-like structures through coordinated intrinsic tissue remodelling.
EmbryologyPreclinical
Self-organising optic cups from 3D embryonic stem-cell culture
Mouse stem-cell aggregates formed optic-cup-like structures through coordinated intrinsic tissue remodelling.
EmbryologyMouse stem-cell organoids / optic-cup folding
Retinal optic-cup organoids do not replicate mature human iris texture.
2010OriginalWnt signalling maintains PITX2 in ocular neural crest
Study authors · Developmental DynamicsCanonical Wnt/β-catenin signalling was required to maintain rather than initiate PITX2 expression in developing ocular neural crest.
Cell migrationPreclinical
Wnt signalling maintains PITX2 in ocular neural crest
Canonical Wnt/β-catenin signalling was required to maintain rather than initiate PITX2 expression in developing ocular neural crest.
Cell migrationNeural-crest Ctnnb1 knockout / promoter analysis
Genetic mouse perturbation does not identify a unique mechanism for iris texture.
2009ReviewGenetics of human iris colour and patterns
Sturm · Pigment Cell & Melanoma ResearchDescribes colour and texture biology across anterior border, stroma and pigment epithelium.
PigmentationDirect development
Genetics of human iris colour and patterns
Describes colour and texture biology across anterior border, stroma and pigment epithelium.
PigmentationIris pigment / cell layers
A tissue-development review is not a systemic diagnostic map.
2009OriginalLocal pigment-cell interactions and zebrafish stripe regeneration
Nakamasu et al. · PNASLaser ablation revealed interactions between pigment-cell classes that support self-organising stripe patterns.
Pattern theoryConceptual analogy
Local pigment-cell interactions and zebrafish stripe regeneration
Laser ablation revealed interactions between pigment-cell classes that support self-organising stripe patterns.
Pattern theoryPigment-cell ablation / regeneration / zebrafish
Animal skin patterning should not be represented as a direct human iris finding.
2008ReviewIris development in vertebrates: genetic and molecular mechanisms
Davis-Silberman & Ashery-Padan · Brain ResearchExplains optic-cup and periocular-mesenchyme contributions, iris musculature and signalling during development.
Iris developmentDirect development
Iris development in vertebrates: genetic and molecular mechanisms
Explains optic-cup and periocular-mesenchyme contributions, iris musculature and signalling during development.
Iris developmentIris embryology
Developmental mechanisms are not direct explanations of each individual's visible iris crypts.
2007ReviewFOXC1 and PITX2 in anterior-segment development
Sowden · EyeReviews how FOXC1 and PITX2 regulate periocular mesenchyme differentiation.
Developmental geneticsDevelopmental evidence
FOXC1 and PITX2 in anterior-segment development
Reviews how FOXC1 and PITX2 regulate periocular mesenchyme differentiation.
Developmental geneticsNeural crest / mesenchyme
Mechanistic interpretation relies heavily on developmental and experimental models.
2005OriginalPITX2 in neural crest and ocular anterior-segment formation
Human Molecular GeneticsNeural-crest-specific Pitx2 loss disrupted ocular tissue specification and blood-vessel development.
Developmental geneticsPreclinical
PITX2 in neural crest and ocular anterior-segment formation
Neural-crest-specific Pitx2 loss disrupted ocular tissue specification and blood-vessel development.
Developmental geneticsConditional mouse knockout
Mouse perturbation is mechanistic evidence, not a normal-human iris prediction model.
Open datasets & validation
Zenodo research records selected for potential independent benchmarking. These datasets have NOT yet been processed by Irispectra. Reference status is not validation.
PsPM-EWO: Emotional words and pupil response · Reference only
DOI: 10.5281/zenodo.4147044 · Participants: 37 healthy adults · Sampling: Not verified
Device: Eye tracker (model to verify) · Modality: Pupil size, gaze, events, responses
Proposed benchmark: Task-locked pupil analysis
Limitations: Emotional-word task differs from Irispectra's protocol. · Licensing: Verify before reuse
Open original dataset ↗AFFEC: Multimodal physiology · Reference only
DOI: 10.5281/zenodo.14794876 · Participants: Check dataset metadata · Sampling: 149 Hz pupil; 62 Hz gaze
Device: Check acquisition metadata · Modality: Pupil diameter, eye position, validity flags
Proposed benchmark: Blink and invalid-frame filtering
Limitations: Not a webcam PLR ground truth. · Licensing: Verify before reuse
Open original dataset ↗PopEYE: NIR ocular image dataset · Reference only
DOI: 10.5281/zenodo.18430187 · Participants: 22; 14,976 images · Sampling: Still images
Device: Custom NIR ophthalmic setup · Modality: Open/closed eye and gaze direction
Proposed benchmark: Frame quality and gaze alignment
Limitations: NIR images are not equivalent to RGB webcam pupil estimates. · Licensing: Copyright; verify permission
Open original dataset ↗Eye-tracking records of visual disorders · Reference only
DOI: 10.5281/zenodo.17046553 · Participants: 10 webcam comparison; 5 amblyopia · Sampling: Not verified
Device: Tobii Pro Spectrum, webcam, Pupil Core · Modality: Gaze, saccades and fixations
Proposed benchmark: Webcam versus tracker comparison
Limitations: Not a pupil-diameter ground-truth dataset. · Licensing: Verify before reuse
Open original dataset ↗Induced pupil fluctuations and visual awareness · Reference only
DOI: 10.5281/zenodo.1006000 · Participants: Check publication · Sampling: Check EDF metadata
Device: Eye tracker · Modality: Raw gaze, time and pupil size
Proposed benchmark: Time-series preprocessing
Limitations: Different stimulus and arbitrary pupil units. · Licensing: Verify before reuse
Open original dataset ↗Next: confirm licenses and acquisition metadata, import data, run QC on held-out records, then publish reproducible metrics and failure cases.
Different modalities. Different claims.
Retinal fundus imaging, optical coherence tomography, external-eye photography, iris morphology and pupillometry are different measurement modalities. A reported association in one modality does not validate an inference in another. Exploratory classification accuracy is not independent clinical validation, and iris-zone-to-organ mapping is not established by this literature.
The publications are a selected research bibliography, not an exhaustive systematic search. Study descriptions are editorial summaries; always consult the original paper for methods, cohorts and uncertainty.