Night BlindnessBlindnessXerophthalmiaEye Diseases, HereditaryElectroretinographyVitamin A DeficiencyGenetic Diseases, X-LinkedDark AdaptationNepalBlindness, CorticalRetinitis PigmentosaVitamin AMyopiaRetinal Rod Photoreceptor CellsRhodopsinNight CareAlbinism, OcularPedigreeRetinal DiseasesRetinaVisual AcuityRetinal Bipolar CellsVision, LowRetinal DegenerationFundus OculiEye DiseasesGenes, RecessiveRetinal Cone Photoreceptor CellsOnchocerciasis, OcularX ChromosomePregnancy ComplicationsElectrooculographyEye ProteinsPhotoreceptor CellsTRPM Cation ChannelsCataractMutationG-Protein-Coupled Receptor Kinase 1ArrestinPhotoreceptor Cells, VertebrateGenetic LinkageDNA Mutational AnalysisVisually Impaired Personsbeta CaroteneConsanguinityVision, OcularSensory ThresholdsLightCircadian RhythmCalcium Channels, L-TypeMutation, Missense