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A 30-year-old member asked:

how to tell if i have astigmatism?

5 doctor answers7 doctors weighed in
Dr. Tim Conrad
Ophthalmology 34 years experience
Most people do: Most people have astigmatism which is when the front of the eye is not a perfect sphere. With significant astigmatism, your uncorrected (without glasses or contacts) vision is blurred. So if you don't have blurred vision, you don't have significant astigmatism. If you do have blurred vision, your eye doctor can tell you if it is due astigmatism or another cause.
Dr. Niraj Patel
Ophthalmology 27 years experience
Astigmatism: It's hard to know if you have astigmatism without an eye exam. Astigmatism is one type of refractive error. Myopia (or nearsightedness), hyperopa (or farsightedness), and astigmatism all can cause refractive error which is what causes a patient to require glasses or contact lenses to see better. Astigmatism is typically when the cornea is shaped more like a football than a basketball.
Dr. Niraj Patel
Ophthalmology 27 years experience
Astigmatism: Astigmatism is one type of refractive error. Myopia (or nearsightedness), hyperopa (or farsightedness), and astigmatism all can cause refractive error. Refractive error is what causes a patient to require glasses or contact lenses to see better. Astigmatism is typically when the cornea is shaped more like a football than a basketball. Glasses, contact, and LASIK can fix this problem.
Dr. Niraj Patel
Ophthalmology 27 years experience
Astigmatism: It's hard to know if you have astigmatism without an eye exam. Astigmatism is one type of refractive error. Myopia (or nearsightedness), hyperopa (or farsightedness), and astigmatism all can cause refractive error which is what causes a patient to require glasses or contact lenses to see better. Astigmatism is typically when the cornea is shaped more like a football than a basketball.
Dr. Richard Bensinger
Ophthalmology 52 years experience
Evaluation: If you have gotten eyeglasses the astigmatism will be built in - just rotate the lens and look at a series of parallel lines and they will dramatically change as you turn it. If you have never had glasses, and you have it, it is probably minor but an ophthalmologist can easily measure you (refraction) to determine if it is present. It is not a big deal and is easily correctable mostly.

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A 46-year-old member asked:

How you can tell what type of astigmatism you need to treat?

1 doctor answer1 doctor weighed in
Dr. Richard Bensinger
Ophthalmology 52 years experience
Examination: Astigmatism most is due to an oval configuration of the eye treated with a reverse oval in the eyeglasses or contact lenses. A few cases are irregular and can only be treated with contacts. Your ophthalmologist can tell you which kind you have.
A 33-year-old member asked:

Could you tell me what happens if someone with astigmatism wear color contacts?

1 doctor answer1 doctor weighed in
Dr. Tim Conrad
Ophthalmology 34 years experience
Their eyes: Change color. Be sure to get the colored contacts that correct astigmatism.
A 47-year-old member asked:

Can you tell me is having astigmatism a bad thing?

1 doctor answer1 doctor weighed in
Dr. Niraj Patel
Ophthalmology 27 years experience
Astigmatism: Astigmatism is one type of refractive error. Myopia (or nearsightedness), hyperopa (or farsightedness), and astigmatism all can cause refractive error. Refractive error is what causes a patient to require glasses or contact lenses to see better. Astigmatism is typically when the cornea is shaped more like a football than a basketball. Glasses, contact, and LASIK can fix this problem.
A 46-year-old member asked:

Astigmatism prescription to spherical prescription, can you tell me more?

1 doctor answer1 doctor weighed in
Dr. Tim Conrad
Ophthalmology 34 years experience
Yes: The spherical equivalent to a sphere plus astigmatism prescription is obtained by adding half of the amount of astigmatism to the sphere. This number can be used to calculate the contact lens prescription of a low astigmat, typically a diopter or less of astigmatism.
A 36-year-old member asked:

Can you tell me in astigmatism, he wrote od 43.75 43.00 os 43.50 42.75 does anyone understand these numbers?

1 doctor answer1 doctor weighed in
Dr. Alan Jackson
Addiction Medicine 30 years experience
Curvature of cornea: These numbers are diopter power readings of the surface of the cornea. These measurements can be taken with a Keratometer or Corneal Topographer. Tha amount of corneal astigmatism is the difference between the two numbers for each eye. This does not indicate how much astigmatism correction would be in your glasses as there are other factors that can contribute to astigmatism.

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Last updated Sep 12, 2017

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