A group of disorders, glaucoma is characterized by high intraocular pressure (IOP) that damages the optic nerve. Glaucoma may occur as a primary or congenital disease or secondary to other causes, such as injury, infection, surgery, or prolonged topical corticosteroid use.Primary glaucoma has two forms: open-angle (also known as chronic, simple, or wide-angle) glaucoma and angle-closure (also known as acute or narrow-angle) glaucoma. Angle-closure glaucoma attacks suddenly and may cause permanent vision loss in 48 to 72 hours (Mills, 2006).
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