About 10 percent of people with open-angle glaucoma undergo surgery. They choose surgery because they prefer it or because they experience serious side effects from medications, do not respond adequately to drug treatment, are unable to take their medications properly, or have medical conditions or allergies that do not permit optimal drug therapy. The two most common surgical procedures are laser trabecular surgery and filtration surgery. While surgery cannot restore lost vision, it can reduce intraocular pressure (IOP) by improving the drainage of aqueous humor. As a result, surgery can halt the progression of optic nerve damage and vision loss.
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