How is Astigmatism Diagnosed?
Only a licensed ophthalmologist or optometrist can perform a comprehensive eye exam needed to diagnose astigmatism or any vision problems. When an ophthalmologist or optometrist tests for astigmatism, they look into how your eye focuses on light. An eye examination may include the following tests:
Visual Acuity Test
This test measures a person’s visual acuity by determining the smallest letters they can read on a visual acuity chart, which can be letters or photos. Usually, the doctor will ask you to cover one eye while you attempt to read the smallest letters on the chart.
Refraction
This eye exam will measure how well your eyes are able to focus. During this test, the doctor will ask you to sit on a chair with a “phoropter” or “refractor” in front of you. You will then look through the phoropter and try to name all the letters on an eye chart located six meters away from you.
The doctor will change the lens for both eyes and will ask you which looks clearer or blurrier, in order to determine the strength needed for your prescription glasses.
Keratometry
Eye exams will also make use of a “keratometer,” which is a device that measures the curvature of the cornea and it will tell the doctor about the ideal fit for contact lenses if you opt to get them. The curvature of the cornea will also help determine astigmatism in either of the eyes.
Astigmatism Causes and Remedies
After understanding its symptoms, you can learn more about astigmatism causes and remedies.
Most people have some degree of astigmatism that doesn’t require treatment, caused by slight irregularities in their eye shapes. In fact, it’s uncommon to come across a perfectly round eye. Although there isn’t a direct cause of astigmatism, research has shown that astigmatism is hereditary. Meaning, if someone in your family has this vision problem, then you’re more likely to develop it.
Astigmatism can also develop after surgery or eye-related disease or injury. Contrary to popular belief, astigmatism isn’t directly caused by bad habits like reading without enough light or sitting too close to the television.
Astigmatism can also be related to a condition called “keratoconus,” which happens when the cornea thins out and becomes cone-shaped, resulting in blurry vision and light sensitivity.
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