Follow-up study of blindness attributed to cataract in Karnataka State, India

Rapid assessments for cataract blindness in persons aged 50 years and older can be conducted at district level in India with existing resources and at affordable costs. The results suggest an increase in cataract blindness since the previous survey of 1986. The long-term visual outcome needs improvement. Change in barriers to cataract surgery requires a shift in health education strategy and messages. The large variation in prevalence justifies district-level surveys. A change in the sampling frame from 15 clusters of 90 to 28 x 40 or 37 x 30 will increase the precision.