Astigmatism



Hornhautverkrümmung oder Astigmatismus

Ideally the curvature of the cornea is uniform as a spherical surface. Astigmatism occurs when the corneal surface has varying curves. The surface will then be more like an egg than a sphere. Due to the different curvatures, the light is refracted differently through the different curvatures of the cornea, e.g. vertical light rays are refracted differently from horizontal. This results in a distorted image, e.g. a dot may appear as a line.


The correction of astigmatism is safely carried out with the excimer laser. This method can concurrently correct existing near- or farsightedness.

 

 

 

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