Astigmatism is a visual condition that causes blurred vision due to the irregular shape of the cornea. This prevents light from focusing properly on the retina. As a result, vision becomes blurred at any distance.

Astigmatism often accompanies other visual conditions like myopia and hyperopia.

The cause of astigmatism is tension in the eye muscles and there are three primary types of it:

• Myopic astigmatism: One or both principal meridians of the eye are short-sighted.
• Hyperopic astigmatism: One or both principal meridians of the eye are long-sighted.
• Mixed astigmatism: One meridian is short-sighted, and the other is long-sighted.