Contact lenses for astigmatism
Toric contact lenses are intended for the correction of astigmatism. Besides power, base curve, and diameter, toric contact lenses also have an axis and cylindrical power, special parameters necessary to correct astigmatism. Astigmatism is usually caused by an irregular curvature of the cornea that needs correction to enable perfect vision. That can be achieved with the help of aspheric contact lenses.