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BlindnessNight BlindnessBlindness, CorticalVision, LowOnchocerciasis, OcularCataractVisually Impaired PersonsXerophthalmiaTrachomaEye Diseases, HereditaryVisual AcuityEye DiseasesVision DisordersGlaucomaCataract ExtractionRefractive ErrorsVitamin A DeficiencyEye InjuriesElectroretinographyMacular DegenerationPrevalenceCorneal DiseasesNepalColor Vision DefectsRetinaOnchocerca volvulusOptic AtrophyRetinal DiseasesOphthalmologyDiabetic RetinopathyRetinal DegenerationCorneal OpacityRetinitis PigmentosaIndiaGenetic Diseases, X-LinkedEye ProteinsOnchocerciasisAmaurosis FugaxAge DistributionKeratitisDark AdaptationGlaucoma, Open-AngleAphakiaRural HealthVision, OcularNigeriaRetinal Rod Photoreceptor CellsLeber Congenital AmaurosisSex DistributionEducation, SpecialRetinopathy of PrematurityTrichiasisHealth Surveyscis-trans-IsomerasesPhotoreceptor Cells, VertebrateCartoons as TopicPedigreeEducation of Visually DisabledVision ScreeningEyeglassesMyopiaRhodopsinWorld HealthUveitisOmanMutationVision TestsVitamin ACross-Sectional StudiesFundus OculiSensory AidsTongaOnchocercaField Dependence-IndependenceInfant, NewbornRisk FactorsSudanOptical IllusionsRetinal Cone Photoreceptor CellsPhotic StimulationRetinal Pigment Epithelium