What is it?

Astigmatism is an ocular defect characterized by a different refraction between two ocular meridians, which prevents clear focus of objects.

Generally, it is due to an alteration in the anterior curvature of the cornea.

There are three basic types of astigmatism: hyperopic, myopic, and mixed. It can exist isolated or associated with myopia or hyperopia.

Symptoms

The main symptom is a decrease in visual acuity, mainly in cases of high astigmatism. The accommodative effort of patients not adequately corrected leads to visual fatigue or asthenopia. Other symptoms include headache, frequent blinking, eye redness, and poor school/University performance.

Treatment

Mild or moderate astigmatism can be corrected with glasses or contact lenses. Some years ago, the only contact lenses indicated for the correction of astigmatism were rigid ones. Currently, there are soft contact lenses (called toric contact lenses) that can correct astigmatism.