Correction of Astigmatism
Normally, the surface of the cornea is curved evenly like the surface of a ball. In the case of astigmatism, the curvature is stronger in one direction than in the other, and the corneal surface resembles that of an egg or a football rather than that of a round ball. As a result, images appear distorted. The nearsightedness and farsightedness are often accompanied by a mild astigmatism.
Toric lenses are special, individually produced lenses that correct nearsightedness or farsightedness as well as an accompanying astigmatism. They can be used for lens implants and lens exchanges.
Astigmatic Keratotomy is used to reduce severe astigmatism of 5 dpt or higher.
Collagen Cross-Linking using Riboflavin and UVA exposure
Collagen Cross-Linking is used to stabilize a weakened cornea due to a keratoconus or keratectasia.