Vision is not clear at any distance. Cornea and/or lens shape are not completely round and regular.

It can be mild or sometimes severe. Keratoconus is a specific corneal condition that features usually high and irregular astigmatism.

Astigmatism is a type of refractive error of the eye. Refractive errors cause blurred vision and are the most common reason why a person goes to see an eye professional.

Causes

People are able to see because the front part of the eye (cornea) is able to bend (refract) light and focus it onto the back surface of the eye, called the retina.

If the light rays are not clearly focused on the retina, the images you see may be blurry.

With astigmatism, the cornea is abnormally curved, causing vision to be out of focus.

The cause of astigmatism is unknown. It is usually present from birth, and often occurs together with nearsightedness or farsightedness.

Astigmatism is very common. It sometimes occurs after certain types of eye surgery, such as cataract surgery.

Symptoms

Astigmatism makes it difficult to see fine details, either close up or from a distance.

Treatment

Mild astigmatism may not need to be corrected.

Glasses or contact lenses will correct astigmatism, but do not cure it.
Laser surgery can help change the shape of the cornea surface to eliminate astigmatism, along with nearsightedness or farsightedness.

Possible Complications

In children, uncorrected astigmatism in only one eye may cause amblyopia (lazy eye).