Astigmatism is a condition of the eye that causes blurred vision due to a difference in the curvatures of the eye.

Astigmatism tends to blur your vision at all distances. It is often present in childhood and usually occurs with nearsightedness or farsightedness.

Astigmatism can be corneal or lenticular. Corneal astigmatism occurs when the front surface of your eye (cornea) has a different curvature in one direction. Lenticular astigmatism is a result of a difference in curvature in the lens. The common comparison is to that of a basketball and football. The basketball has an equal curvature whereas a football has a difference between the surface curves creating the oblong shape. In either type of astigmatism, corrective lenses are designed to create a clear focus based on the different curves measured. This can be accomplished for most patients with standard eyeglasses and contact lenses.