I-Onchocerciasis, ikwaziwa njenge-river blindness ne-Robles disease, isisifo esibangelwa lusuleleko lwentshulube esisifunxi-gazi i-Onchocerca volvulus. Iimpawu ziquka ukurhawuzelelwa ngamandla, iingongoma ezingaphantsi kwesikhumba, kunye nobumfama. Ingunobangela wesibini oxhaphakileyo wobumfama obubangelwa sisifo esosulelayo, emva kwe-trachoma.