background: cataract is the main cause of treated blindness in the world. it is considered that 20 millions of blind people because cataract exist, being these ones responsible for the 50% of blindness at world level. objective: to determine the prevalence of cataract in camagüey municipality from december 2006 to june 2007. method: a descriptive study in patients with cataract attended at the ophthalmological center of camagüey carlos j. finlay was performed. the study universe was constituted by six-hundred-five patients older than fifteen years attended in the consultation of cataract. the sample was selected by means of experts- criterion, which was integrated by fifty-seven patients with cataract diagnostic. the study variables were: age, sex, occupation, visual acuity, cause of cataract. results: it was determined that the greatest percent of patients presented a severe visual loss; 52,23% had no risk occupations. the senile cause represented 68, 79% of the cases and the general prevalence was about the 25,95%. conclusions: cataract prevalence increased with the age.