A cornea with an irregular shape causes astigmatism, which causes blurry vision. The cornea is less spherical and more shaped like a football or an egg in patients with astigmatism.
When light enters an astigmatic eye, it is bent and refracted to several focus sites inside the eye as opposed to only one focus point on the retina. The two different types of astigmatism.
Astigmatism that is regular as opposed to irregular is far more prevalent.
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