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Blindness is a lack of vision. It may also refer to a loss of vision that cannot be corrected with glasses or contact lenses.
People with vision worse than 20/200 are considered legally blind in most states in the United States.
Blindness has many causes. In the United States, the leading causes are diabetes , glaucoma, macular degeneration , and accidents (such as chemical burns or sports injuries).
Worldwide, the leading causes of blindness are cataracts, onchocerciasis (river blindness), trachoma, leprosy, and vitamin A deficiency .
Other causes include:
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