Onchocerciasis, OcularOnchocerca volvulusRiversBlindnessIvermectinOnchocercaOnchocerciasisKeratitisAbelmoschusNight BlindnessFilaricidesWolbachiaSimuliidaeBrugia malayiAntiparasitic AgentsBlindness, CorticalAnthelminticsCorneaGoniothalamusVision, LowCataractVisually Impaired PersonsFresh WaterXerophthalmiaTrachomaEye Diseases, HereditaryVisual AcuityEye DiseasesWater MovementsWater Pollutants, ChemicalVision DisordersGlaucomaCataract ExtractionRefractive ErrorsWater PollutionVitamin A DeficiencyEye InjuriesElectroretinographyMacular Degeneration