About 40 million people in the world are blind. The prevalence of blindness in most industrialized countries of Europe and North America varies between 0.15% and 0.25%, compared with blindness rates of nearly 1.5% for the developing countries in Africa, Asia and Latin America. While age-related macular degeneration, diabetic retinopathy, and glaucoma are the dominant causes in developed countries, cataracts are the major cause of blindness in the developing countries, accounting for nearly 75% of all cases in Asia.
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Rangan et al. (2007) studied this question.
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