Astigmatism

Astigmatism is a common refractive error caused by an uneven curvature of the cornea or lens, leading to distorted or blurred vision at all distances.

Common symptoms

Blurred or distorted vision at all distances, eye strain, headaches, and difficulty seeing fine detail or at night.

Description

Astigmatism is a refractive error caused by the cornea or lens of the eye having a slightly irregular curve, more like a rugby ball than a football. This means light is focused unevenly on the retina, producing blur at all distances.

Many people have a small amount of astigmatism and may not need correction. Larger amounts can cause noticeable blur, especially at night, and may contribute to tired eyes and headaches.

Astigmatism is usually corrected with glasses, toric contact lenses, or refractive surgery. It can occur on its own or alongside short- or long-sightedness.