Night BlindnessBlindnessXerophthalmiaEye Diseases, HereditaryElectroretinographyVitamin A DeficiencyGenetic Diseases, X-LinkedDark AdaptationNepalNight CareBlindness, CorticalRetinitis PigmentosaMyopiaVitamin ARetinal Rod Photoreceptor CellsRhodopsinAlbinism, OcularPedigreeRetinal DiseasesRetinaVisual AcuityCircadian RhythmRetinal Bipolar CellsVision, LowRetinal DegenerationFundus OculiElectrooculographyEye DiseasesGenes, RecessiveRetinal Cone Photoreceptor CellsX ChromosomePregnancy ComplicationsOnchocerciasis, OcularEye ProteinsSleepPhotoreceptor CellsTRPM Cation ChannelsMutationWork Schedule ToleranceCataractG-Protein-Coupled Receptor Kinase 1LightPhotoreceptor Cells, VertebrateArrestinGenetic Linkagebeta CaroteneDNA Mutational AnalysisVisually Impaired PersonsConsanguinityVision, OcularSleep DeprivationSensory ThresholdsSleep StagesCalcium Channels, L-TypeMutation, Missense