Understanding astigmatism: causes, symptoms, and treatment

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What you need to know

Astigmatism is a common and treatable vision condition that affects how clearly you see. It happens when the front surface of the eye, or the lens inside the eye, is not perfectly round. Light does not focus properly, so vision can look blurry or distorted.

The good news? With the right diagnosis and treatment, most people with astigmatism see clearly and comfortably.

What does astigmatism do to your eyes?

When the eye's shape is irregular, it has to work harder to focus. Over time, this extra effort can lead to discomfort, including:

Eye strain or fatigue
Squinting to see clearly
Headaches, especially after reading or screen use

Many people don't realize these symptoms are related to their vision until they get an eye exam.

What does astigmatism do to your vision?

Astigmatism can make objects look blurred, stretched, or slightly shadowed. Symptoms can be mild or more noticeable, and they may change over time. You may notice:

Blurry vision at both near and far distances
Difficulty seeing clearly at night
Trouble focusing on fine details
Shadowed images
Visual discomfort during prolonged tasks

Risk factors

Astigmatism is very common and often starts in early childhood. It can develop due to:

  • Eye injury or eye disease
  • Genetics (it can run in families)
  • Previous eye surgery
  • Eye rubbing

How do I know if I have astigmatism?

The only way to know for sure is with a comprehensive eye exam. Some people notice symptoms, while others, including children, may not realize their vision is blurred.

Regular eye exams matter most for children, because untreated astigmatism can affect learning, reading, and visual development.

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How is astigmatism treated?

Astigmatism is highly manageable. Treatment options may include:

EyeglassesLenses customized to your prescription correct the way light focuses on the retina.
Contact lensesToric soft lenses and rigid gas permeable lenses are designed specifically for astigmatism.
exactFit driving lensesSharpen road signs and your dashboard, and cut glare for safer, more comfortable driving at night.

The best option depends on your vision needs, lifestyle, and eye health. Your optometrist will help guide that decision.

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If you're experiencing any of these symptoms, it's time to book an eye exam.

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Frequently asked questions

  • Yes, it can change. Astigmatism is often stable in adults, but it can shift during childhood and adolescence, or after an eye injury or surgery. Regular eye exams track any change and keep your prescription accurate.

  • Often, yes. Mild astigmatism may cause no obvious symptoms, and children in particular rarely report blurred vision because they assume everyone sees the way they do. An eye exam is the only reliable way to find it.

  • It can. When the eye works harder to focus, that effort leads to eye strain, which can bring on headaches, especially after reading or a long stretch of screen time.

  • Glasses and contact lenses correct astigmatism while you wear them. Laser vision correction reshapes the cornea for a longer-lasting result, though it is not suitable for everyone. Your optometrist can talk you through the options.

  • Yes, and it is often present from birth. Because untreated astigmatism can affect reading and learning, children should have an eye exam before starting school and at regular intervals afterwards.