Astigmatism is a defect of vision caused by inequalities in the shape of the cornea producing a bad refraction. These inequalities distort the image perceived by the eye.
Astigmatism can be very mild and does not affect vision, but can still cause eye strain or headache. In other cases, blurred vision may occur only occasionally.
Astigmatism can occur after surgery or trauma (accident, illness). It can be hereditary.
The astigmatism is a blurred vision, no matter the distance of the image. For example, a point can be seen as a straight line. In some cases, the image can be seen similar to that proposed by a distorting mirror.
When the astigmatism is regular, that is to say, a regular deformation, the vision is easily corrected by glasses or laser surgery.
An irregular distortion of the image is more difficult to correct and should be treated by laser. The laser surgery is to restore a spherical shape to the cornea. Several operations may be necessary.
30 mai 2010
| The text above is for information purposes only. Only a doctor can diagnose a disease. No treatment (medication or scheme) should be undertaken without consulting a health professional. |