Slide show: Age-related vision problems
Photos depicting vision with glaucoma
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The most common type of glaucoma — primary open-angle glaucoma — causes tunnel vision and loss of side vision, but only in the advanced stages of the disease. Acute angle-closure glaucoma, which is less common but considered a medical emergency, causes severe eye pain and redness.

To detect glaucoma early, consult your eye doctor for regular eye exams. Seek immediate medical attention if you have severe eye pain or other signs and symptoms of glaucoma. Treatment options may include medication, laser therapy or surgery.

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