Optic nerve edema can temporarily or permanently reduce vision . The pathologic changes that may result from chronic angle-closure glaucoma include enlargement of the optic cup and a diminished visual field (Houde 2007 44 . The principal goal of glaucoma treatment is to reduce the intraocular pressure enough to avoid optic nerve damage . Open-angle glaucoma is insidious in onset with no symptoms , not even pain or subjective visual disturbance . This is one reason why ophthalmologists recommend annual examinations in people over age...











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