Accessibility View Close toolbar

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.

Exclusive Offer

New Patients receive 30% OFF Second Pair of Polarized Prescription Sunglasses

Hours of Operation

Our Regular Schedule

McAllen

Monday:

8:30 am-5:00 pm

Tuesday:

8:30 am-7:00 pm

Wednesday:

8:30 am-5:00 pm

Thursday:

8:30 am-7:00 pm

Friday:

8:30 am-5:00 pm

Saturday:

Closed

Sunday:

Closed

Harlingen

Monday:

10:00 am-6:00 pm

Tuesday:

10:00 am-6:00 pm

Wednesday:

10:00 am-6:00 pm

Thursday:

10:00 am-6:00 pm

Friday:

10:00 am-6:00 pm

Saturday:

10:00 am-6:00 pm

Sunday:

Closed

Location

Find us on the map

Testimonials

Reviews From Our Satisfied Patients

  • "RGV Family Eye Care is the best at what they do and make you feel right at home."
    Amanda W.
  • "The Doctors and staff are courteous and very professional. I wholeheartedly recommend RGV Family Eye Care!"
    Jane D.

Featured Articles

Helpful and Informative Resources

  • What Do Your Eyes Say About Your Health?

    Subtle changes in your eyes may be the first signs of a health problem. ...

    Read More
  • Makeup Tips for Sensitive Eyes

    Does your cosmetics make your eyes water and burn? Try these makeup tips for sensitive eyes. ...

    Read More
  • How to Clean Your Eyeglasses

    Do you know how to clean your eyeglasses correctly? Take a look a few tips that will keep your specs cleaner. ...

    Read More
  • All About Amblyopia

    Amblyopia, also known as lazy eye, is a visual disorder caused by abnormal vision development, often occurring during infancy. Patients with amblyopia have reduced vision in one eye, because it is not working properly in conjunction with the brain. With early detection and proper treatment, loss of ...

    Read More
  • All About Glaucoma

    Glaucoma is a serious disorder that can damage the optic nerves of your eyes if left untreated. The optic nerve carries images from your eyes to your brain. If the nerve is damaged, full or partial vision loss can occur. In some cases, people develop glaucoma because the pressure in their eyes begins ...

    Read More
  • Binocular Vision: Disorders and Treatment

    For many, the term binocular vision conjures images of super powers or the rare ability to spot objects far away, but having binocular vision simply means having two eyes with which to see. Binocular vision does lend creatures with two eyes advantages over those with only one, such as enhanced vision, ...

    Read More
  • Curbing Macular Degeneration

    Macular degeneration represents one of the most significant causes of vision loss in older adults. According to the Centers for Disease Control and Prevention, an estimated 1.8 million people currently suffer from macular degeneration, with an additional 7.3 million people at risk of developing this ...

    Read More
  • Diabetic Retinopathy: What Is It?

    Diabetic retinopathy refers to several eye problems that are characterized by damage to the light-sensitive retina, caused by excessive blood sugar levels. Almost half of Americans with diabetes suffer from some level of diabetic retinopathy. When glucose levels in the blood are not properly controlled, ...

    Read More
  • Glaucoma Care: What You Need to Know

    Glaucoma is the second leading cause of blindness worldwide, reports the Glaucoma Research Foundation. This common eye condition typically affects older adults, although infants and young adults are also at risk. Fortunately, however, cutting-edge research is improving diagnosis and treatment of this ...

    Read More
  • Strabismus

    Strabismus is the medical term for the misalignment of the eyes. Commonly referred to as cross-eyed or wall-eyed, strabismus may involve either one or both eyes turning inward, outward or even up or down. It is one of the most common vision conditions in young children, affecting somewhere between 2 ...

    Read More

Newsletter Signup

Sign Up to Receive More Articles