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What is the cause of astigmatism?

Pediatric Eye Clinic

Astigmatism is caused by an irregular curvature of the cornea or lens of the eye. If the cornea or lens does not have a uniform curvature, the light rays are not refracted correctly. With astigmatism you have blurred or distorted vision, both close up and from a distance.

Astigmatism is very common. Doctors do not know why the shape of the cornea varies from person to person. What they do know is that the probability of having astigmatism is hereditary.

Astigmatism can appear after an eye disease, injury, or surgery. It is a myth that astigmatism can appear or worsen from reading in low light or sitting too close to television.

Source: AAO

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