What is astigmatism?

Astigmatism is a refractive error that occurs when the front surface of your eye (cornea) or the lens inside the eye is slightly irregular in shape. This results in blurred vision or distortion at all distances. Astigmatism is not a disease, but a common visual condition.

What causes astigmatism?

Astigmatism is caused by small differences in the growth and alignment of the components of the eye. In some cases, it may be hereditary or it may result from such factors as pressure of the eyelids on the cornea.

How common is astigmatism?

Most people have some degree of astigmatism. It is rare to have a perfectly round optical surface. Small amounts of astigmatism may not require correction with glasses. However, moderate to highly astigmatic eyes will need corrective lenses.

What are symptoms of astigmatism?

Even people with mild to moderate astigmatism will usually have blurred or distorted vision. They may experience headaches, eye strain, fatigue, blurred vision, halos, or vision distortion at certain distances.

How is astigmatism diagnosed?

A comprehensive eye exam by your Doctor of Optometry will include tests to check for astigmatism.

Can astigmatism be corrected?

Almost all levels of astigmatism can be corrected with properly prescribed and fitted eyeglasses, or contact lenses. Laser surgery may be an option for appropriate cases.