Astigmatism
The cornea of an astigmatic eye is irregularly shaped, the circle radiuses r1 and r2 being of different size. This causes incoming light rays to undergo deformation, so they do not meet on the retina at a certain point. So, what really is a point appears to be a little stick. The astigmatic eye receives an blurred image which is dragged apart either in length or in height.
Astigmatism is generally combined with far- or near-sightedness. Glasses or contact lenses can correct this vision defect.
Treatment with a Holmium Laser or with an Excimer-Laser can make the different radiuses the length.
The cornea of an astigmatic eye is irregularly shaped, the circle radiuses r1 and r2 being of different size. This causes incoming light rays to undergo deformation, so they do not meet on the retina at a certain point. So, what really is a point appears to be a little stick. The astigmatic eye receives an blurred image which is dragged apart either in length or in height.
Astigmatism is generally combined with far- or near-sightedness. Glasses or contact lenses can correct this vision defect.
Treatment with a Holmium Laser or with an Excimer-Laser can make the different radiuses the length.