What Is Astigmatism?

Image of family wearing glasses.

Astigmatism is an extremely common eye condition that affects both children and adults. It occurs when there is an imperfection in some part of your cornea, the clear tissue that covers your iris. Light rays pass through the cornea as they travel to the retina, a thin layer of cells at the back of your eye. The retina turns light rays into impulses that are transmitted to your brain, which interprets them as images.

Normally, the cornea is completely round. If you have astigmatism, some parts of your cornea may be rounder than others, which can cause a distortion in the way light rays focus on your retina. Astigmatism is considered a refractive error because it affects the way your eyes refract, or bend, light. It often occurs in conjunction with other refractive errors, such as nearsightedness or farsightedness.

Symptoms of Astigmatism

Common symptoms of astigmatism include:

  • Blurred or distorted vision
  • Trouble seeing clearly when driving at night
  • Squinting
  • Eyestrain
  • Headaches

If you have a mild case of astigmatism, you may not notice any changes in your vision.

Diagnosing Astigmatism

Many of the symptoms of astigmatism, such as blurred vision and eyestrain, can also occur if you need glasses or you already have glasses or contacts, but your eyes have gotten worse. Luckily, astigmatism can be easily spotted during an eye examination.

During the examination, your visual acuity will be measured based on your ability to read letters or numbers on an eye chart. The focusing power of your eyes will also be determined, and an instrument called a keratometer may be used to measure the curvature of your cornea. These tests help eye care professionals determine if you have astigmatism.

Treating Astigmatism

Eyeglasses will help improve your vision if you have been diagnosed with astigmatism. Although you probably will not be able to notice any difference just by looking at your new glasses, a subtle change in your lenses will allow you to see better. Glasses improve vision in people with astigmatism because the lens power is increased in a small area of a lens to compensate for the imperfection in your cornea. Some people with astigmatism feel that contacts offer better vision than glasses, but either option will help improve your eyesight.

Reshaping the cornea can alleviate astigmatism temporarily or permanently. Special contact lenses that are worn overnight change the shape of the cornea, allowing you to see clearly during the day. However, if you stop wearing the lenses at night, your symptoms will return. Two types of laser surgery, LASIK and photoreactive keratectomy (PRK), permanently reshape the cornea but may have associated risks.

Helping you make the most of your vision is our priority. If it's been awhile since we have seen you, call us today to schedule an appointment.

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Testimonials

  • We love supporting our local businesses. Dave Nelson is such an asset to our community. He took the extra time needed to be completely thorough with some issues I was having. I love that he looked at my complete health before coming to a conclusion for my needs. We love the customer service from beginning to end. I put complete trust in Lee Ann to pick out some frame choices for me, listening to my wants and needs. She delivered and I am so excited to get them next week. Thank you so much!

    ...
    Show More - C.D.
  • I was extremely pleased with the complete and thorough eye examination I received. Dr. Nelson took a great deal of time explaining his findings so that I understood them. He then laid out a plan for us to follow for the future of my eye health.

    - D.D.
  • I'm impressed with all of the technology. Great service. Thank you!

    - J.O
  • This was the best experience I have had with an eye doctor. I felt like Dr. Nelson actually listened to how my eye sight was affecting my daily routine and properly diagnose my vision correction needs.

    - A.K.
  • I've been a patient of Dr. Nelson for many years and he is absolutely amazing. I am grateful that he uses state-of-the-art tools to measure changes in my eye health. His advice is spot on for caring for my eyes and his prices make it affordable to do so. I highly recommend you schedule your next appointment here

    ...
    Show More - J.B.
  • Exam and discussion of the results were excellent. Dr. Nelson is kind, considerate, and open to any discussion about your eyes. The pictures from the exam were amazing and Dr. Nelson explained everything that was going on with the exam and pictures. Frame and lens selection are outstanding as is the work of the staff in helping to pick out what I wanted. And those sunglasses...oh my...I love them! Great work Dr. Nelson and staff!

    ...
    Show More - T.C.
  • This was the most thorough exam I've ever had and I've had many. Dr. Nelson understood my challenges and I felt confident in his care. Great experience. Thank you

    - L.F.
  • Efficient and courteous service with a sense of belonging to a family. I have had to wear prescription lenses for most of my life. Never, has anyone ever taken the time to explain what happens to our eyes as we age, why and HOW we see floaters (and with the latest technology used in Dr. Nelson's office - to show you these things and so much more.) and other retinal issues if they exist. The latest technology used in Dr. Nelson's office is non-invasive and amazing to literally see the inside of y

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    Show More - P.L.
  • I've seen Dr. Nelson for many years for my eye care before he opened the new practice in Cottage Grove. I appreciate how very thorough he is and how he takes the time to explain any changes in my vision etc. He and his staff are always very kind and friendly and they go the extra mile to help! I liked that Cottage Grove Eye Care was really easy to find...and I like the space and the fact that they have a large selection of cool frames. Would highly recommend it. Nice to have someone you can trus

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    Show More - H.S.
  • I went to Cottage Grove Eye Care for the first time last year and purchased both glasses and contacts. This is the first year that I have consistently worn both the glasses and contacts and didn't experience any issues with either. I always feel much educated about my eye health when I leave in a way that I never was at other eye clinics

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    Show More - E.W.
  • Friendly, professional, very thorough.

    - T.S.

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Monday
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Wednesday
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Thursday
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Saturday
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