If you’ve been diagnosed with astigmatism, you’re not alone. According to the American Optometric Association, most people have some degree of astigmatism. Astigmatism is an irregular curvature of the eye’s cornea or lens that disrupts the refraction of light rays. A healthy eye should have a round shape similar to a basketball, while an eye with astigmatism has a shape more like a football. Slight astigmatism usually doesn’t affect your vision, but in more severe cases you might experience blurred or distorted vision and need corrective lenses or surgery. So what causes astigmatism?
Chances are, it’s nothing you’ve done, so be wary of anyone who tries to convince you that it’s because you sit too close to the TV or read in dim light for too long. We’ve broken down two of the common causes of astigmatism so you can better understand the condition.