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Vision DisordersVisually Impaired PersonsVisual AcuityVision, LowBlindnessEvoked Potentials, VisualVisual CortexVisual PerceptionVisual FieldsVisual PathwaysRefractive ErrorsEye DiseasesVision TestsEducation of Visually DisabledCataractPattern Recognition, VisualPhotic StimulationVision ScreeningVision, OcularVisual Field TestsEyeglassesSensory AidsOnchocerciasis, OcularGlarePrevalenceContrast SensitivityCataract ExtractionBlindness, CorticalOptometryMacular DegenerationVision, BinocularVision, MonocularGlaucomaAttentionOphthalmologyRetinal DiseasesReaction TimeRetinaAmblyopiaMagnetic Resonance ImagingDiabetic RetinopathyAge DistributionMotion PerceptionSpace PerceptionPsychomotor PerformanceBrain MappingEye InjuriesFixation, OcularEye MovementsCross-Sectional StudiesPresbyopiaSensory ThresholdsOptic Nerve DiseasesPsychophysicsSex DistributionIndiaCognition DisordersCuesNeuropsychological TestsElectroretinographyEducation, SpecialMild Cognitive ImpairmentDiscrimination (Psychology)Depth PerceptionTime FactorsColor Vision DefectsHealth SurveysStrabismusAnalysis of VarianceSensory DeprivationForm PerceptionLens DiseasesEye Diseases, HereditaryAudiovisual AidsCorneal OpacityQuestionnairesSaccadesFunctional LateralityAgingOptic NerveReadingNigeriaSickness Impact ProfileHemianopsiaSelf-Help DevicesEye Protective DevicesRefraction, OcularFundus OculiVictoriaBrainChorioretinitisCorneal DiseasesOphthalmoscopyRisk FactorsNeuronsPerceptual DisordersModels, NeurologicalOptic Atrophy, Hereditary, LeberGeniculate BodiesCanes