MicrophthalmosBlindnessColobomaEye, ArtificialAnophthalmosOrbital DiseasesVisually Impaired PersonsVision DisordersVision, LowTissue ExpansionVisual AcuityTissue Expansion DevicesOptic Disk DrusenCystsNight BlindnessBlindness, CorticalEye AbnormalitiesRefractive ErrorsEye DiseasesEvoked Potentials, VisualCataractVisual FieldsVisual CortexVisual PerceptionEducation of Visually DisabledOnchocerciasis, OcularVision TestsVisual PathwaysVision ScreeningPrevalenceSensory AidsEyeglassesCataract ExtractionMacular DegenerationGlaucomaGlareOptometryVision, OcularPhotic StimulationPattern Recognition, VisualOphthalmologyEye Diseases, HereditaryRetinal DiseasesEye InjuriesDiabetic RetinopathyAge DistributionTrachoma