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Globally, there are an estimated 60 million people with glaucomatous optic neuropathy and an estimated 8.4 million people who are blind as the result of glaucoma. These numbers are set to increase to 80 million and 11.2 million by 2020. Glaucoma is the second leading cause of blindness globally. The highest prevalence of open-angle glaucoma occurs in Africans, and the highest prevalence of angle-closure glaucoma occurs in the Inuit. Population-based screening for open-angle glaucoma is not recommended. Screening for angle-closure may be feasible.