Astigmatism

What it is

In astigmatism, the cornea or lens is curved more in one direction than another, so light does not focus to a single point on the retina. This causes blurred or distorted vision at both near and far distances. It often occurs alongside short- or long-sightedness.

Common symptoms

Symptoms are often mild but can cause tiredness.

• Blurred or distorted vision at all distances
• Eye strain or discomfort
• Headaches
• Squinting to try to see clearly, and worse vision at night

Causes and risk factors

Astigmatism is usually due to the natural shape of the cornea or lens and is often present from birth. It can run in families and may change gradually over time.

Treatment

Astigmatism is corrected with glasses, with special toric contact lenses, or with laser refractive surgery for suitable adults. Regular eye tests make sure your correction stays accurate as it can change.