The incidence of cataract and other chronic eye diseases in India
Incidence is a measure of the rate at which individuals in a population develop the condition of interest over time. Measuring incidence is challenging as it requires long-term follow-up of individuals and repeated examination. We are following up individuals who were examined in a survey of blindness and visual impairment undertaken in Andhra Pradesh, India over 10 years ago. Field workers have already traced all those recruited to the initial survey and the findings show that those who had cataracts 10 years ago have a higher mortality rate than individuals of the same age who did not have cataract. This finding has been reported in other studies, suggesting that lens capacities are a biomarker of ageing. All the original study participants who are still alive and living in the same area are undergoing detailed eye examination.
Sightsavers and Lions SightFirst.
L.V.Prasad Eye Institute, Hyderabad; the Public Health Foundation of India, Hyderabad.