What Is Astigmatism?
2. Causes of Astigmatism
The irregular shape of the cornea is the main cause of astigmatism. Normally, the cornea is like a ball, with a symmetrically round shape. However, with astigmatism, the cornea will have an egg shape. One meridian, or half, either longitudinally or latitudinally, will be more curved than the equivalent half.
To simplify this, if we take the lens of the eye like the face of a clock, there would be two meridians: one connecting 12 and 6 and the other connecting 3 and 9.
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