blindness , defined as an inability to count fingers at 3 meters with the better eye ( who , 1973 ) , was present in 762 persons , due to cataract ( 39 % ) , ocular onchocerciasis ( 30 % ) , primary glaucoma ( 8 % ) , measles keratitis ( 3 % ) , trachoma ( 3 % ) and other causes .
C0015392
eye
C0086543
cataract