Onchocerciasis, kana kuti pachirungu river blindness uye Robles disease, chirwere chinokonzerwa neutachiona hunoparirwa nehwemusi rinogara mumuviri Onchocerca volvulus. Zviratidzo zvacho zvinosanganisira kuvaviwa kwakanyanya, mapundu muganda, uye kusaona. Pautachiona hwose hunokonzera kusaona, uhwu hunouya pechipiri, huchitevera hwetrachoma.