Astigmatism is a condition that occurs when the eye cannot focus clearly, causing blurry or distorted vision. It can affect vision of both near and far objects and coexist with myopia or hyperopia.
Astigmatism happens due to normal differences in eye shape. When the cornea (clear outer layer of the eye) or lens (inner part of the eye that helps with focus) has an oval shape, light rays entering the eye are bent incorrectly.
This causes light rays to focus on multiple points instead of a single point. Light rays incorrectly focused on multiple points cause blurry or distorted vision.
Astigmatism is common. It affects approximately one in three people.
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