'Glaucoma is an eye disease that causes damage to the optic nerve. Generally, the damage is due to increased pressure on the nerve (intraocular pressure). It is the second-most common cause of blindness in the U.S. According to the Glaucoma Research Foundation, there are over 60,000,000 people worldwide who suffer from glaucoma.
There are 4 types of glaucoma: chronic, acute, congenital, and secondary glaucoma. The most common type of glaucoma is open-angle (chronic) glaucoma.'
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