Glaucoma is an eye disease that damages the optic nerve, usually due to elevated intraocular pressure. Vision loss can occur if damage is severe or treatment is not instituted. Since glaucoma is one of the leading causes of vision loss, early detection and treatment are necessary to preserve the health of the optic nerve.
There are two basic types of glaucoma. They include:
1. Open-Angle Glaucoma
Open-angle glaucoma is the most common type that occurs in approximately 90 percent of those who suffer from the disease. This condition can develop gradually and be undetected for years, slowly damaging vision.
2. Narrow-Angle Glaucoma
Closed-angle glaucoma (also called angle-closure glaucoma), which is much more rapid in the onset, affects less than ten percent of glaucoma patients. Symptoms occur suddenly and are much more severe, but vision can be preserved with prompt, effective treatment.