It's without a doubt one of the most common type of glaucoma. Open-angle glaucoma usually happens to people over 50. You frequently get it in both eyes, however one eye isn't as bad as the other. You have fluid inside your eyes that keeps them healthy and balanced. As new fluid comes in, the old needs to leave. The angle is where the clear part of your eye, the cornea, fulfills the colored part of your eye, the iris. Because that's where the system to drain your eye liquid rests, it's vital. In some other types of glaucoma, the angle is too narrow or closed, so fluid can't even reach the water drainage system. Your eye can also be generating too much fluid that causes a backup in outflow. It isn't clear what's causing that blockage or causing your eye to produce more fluid than normal. Like with other types of glaucoma, you'll have higher pressure than normal in your eye. In time, that harms the optic nerve, the cord that sends out information from your eye to your brain. As the nerve breaks down, you get dead spots. It's like a torn cord on an old light that makes the light bulb blink on and off. However high pressure can be a little tricky to pin down. It isn't like blood pressure, where the threat zone is clear. About 1 in 3 people with this type of glaucoma have normal pressure in their eyes, but still have a harmed optic nerve.
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