What Is Astigmatism?
astigmatism is a condition in which your eye, particularly your cornea or the clear front part of the eyeball, international relations and security network ’ thymine completely round .
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ideally, an eye is shaped like a perfectly round ball. Light comes into it and bends evenly, which gives you a clear watch. But if your cornea is shaped more like a football, unaccented gets bent more in one commission than another. That means merely part of an object is in focus. Things at a distance may look bleary and wavy.
It ’ second common to have astigmatism along with myopia ( myopia ) or prevision ( hyperopia ). These three conditions are called deflective errors because they involve how your eyes bend ( refract ) clean .
astigmatism is fairly easily for an eye repair to fix with glasses, contacts, or operating room .
Symptoms of astigmatism may include :
- Blurry or distorted vision
- Trouble seeing at night
Most people are born with it, but experts don ’ thyroxine know why. You can besides get it after an eye injury, an eye disease, or surgery.
rarely, a condition called keratoconus can cause astigmatism by making the acquit front region of your eye ( your cornea ) dilutant and more conic. You ’ ll probably need contacts ( but not glasses ) to see distinctly .
You can ’ t get astigmatism from reading in gloomy light or sitting besides close to the television .
astigmatism symptoms come on slowly. Go to an eye doctor if you notice changes in your vision. You ’ ll need a complete eye examination. Your sophisticate will test the asperity of your eyesight by asking you to read an eye chart. They ’ ll besides use tools to measure your vision, including :
Phoropter. You look through a series of lenses to find the ones that give you the clearest vision.
Keratometer. This machine measures the bend in the center of your cornea. It finds the steep and flattest curves. The measurements tell your sophisticate about the determine of your cornea and how well it can focus .
Autorefractor. This device shines fall into your center and measures how it changes as it bounces off the back. This gives your sophisticate an idea of which lenses you need .
Corneal topographer. This engineering gives the most detail information about your cornea ’ randomness supreme headquarters allied powers europe. The doctor tells you to look at a specific indicate. meanwhile, the device collects thousands of bantam measurements. A calculator builds a color map of your cornea from the data. Your repair will refer to it if they plan surgery for astigmatism or cataracts. They might use it to fit contacts. It can besides help diagnose keratoconus .