Astigmatism occurs when the cornea is shaped more like an oblong egg rather than a spherical ball, which is the normal shape. In most astigmatic eyes, the oblong or oval shape causes light rays to focus on two points in the back of your eye, rather than on just one. This is because, like an egg, an astigmatic cornea has a steeper curve and a flatter one
Refractive eye laser surgery will reshape the cornea to correct the corneal curvature.
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