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| | GLAUCOMA, |
 | | So-called chronic open-angle, or wide-angle, glaucoma is the most common form of glaucoma in the U.S. In this condition the drainage angle remains open, with no damage visible, but drainage of the aqueous fluid is impaired and intraocular pressure typically increases. |
 | | In some cases, known as low-tension, or normal-tension, glaucoma, the optic nerve may become damaged while eye pressure is in the normal range, perhaps because the nerve is abnormally sensitive or suffers a reduced blood supply as a result of atherosclerosis. |
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