It's by far the most common type of glaucoma. Open-angle glaucoma usually takes place to people over 50. You typically get it in both eyes, however one eye isn't as bad as the other. You have fluid inside your eyes that maintains them healthy and balanced. As new liquid is available in, the old has to move out. That's where the "open angle" comes in. The angle is where the clear part of your eye, the cornea, satisfies the colored part of your eye, the iris. It's important because that's where the system to drain your eye fluid rests. In a few other types of glaucoma, the angle is closed or too narrow, so fluid can't even get to the water drainage system. Your eye can additionally be producing excessive liquid that causes a back-up in outflow. It isn't clear what's creating that blockage or causing your eye to create more fluid than normal. Like with other types of glaucoma, you'll have higher pressure than normal in your eye. In time, that damages the optic nerve, the cord that sends out details from your eye to your brain. As the nerve breaks down, you get blind spots. It's like a frayed cable on an old light that makes the light bulb blink on and off. It isn't like blood pressure, where the risk zone is clear. About 1 in 3 people with this type of glaucoma have normal pressure in their eyes, but still have a damaged optic nerve.
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