Optic nerve can have damage {glaucoma}|.
causes
High intraocular pressure (IOP), eye injury, inflammation, tumor, advanced cataract, advanced diabetes, and steroid drugs can damage optic nerve.
types
Primary open-angle glaucoma (POAG) affects three million in USA. Eye-drainage canals clog, and inner-eye pressure increases. It has no symptoms and is gradual. It has easy treatment.
Blocked drainage canals can cause acute angle-closure glaucoma {narrow-angle glaucoma}. When pupil enlarges too much or too quickly, outer iris edge bunches up over drainage canals. Iris cannot open wide. Symptoms include headaches, eye pain, nausea, colors around lights at night, and blurred vision. Surgery can remove small region at outer iris edge.
Normal-tension glaucoma (NTG) {low-tension glaucoma} {normal pressure glaucoma} has optic nerve damage with almost normal intraocular pressure from 12 mm Hg to 22 mm Hg.
Biological Sciences>Medicine>Disease>Kinds>Organ>Nerve>Eye
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Date Modified: 2022.0224