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cheyenne astigmatism

 

Refractive errors are one potential cause of blurred vision. The most common refractive errors are myopia (nearsightedness), hyperopia (farsightedness) and astigmatism (distorted vision); it is possible to have more than one refractive error at a time.

Myopia
A myopic eye is longer than normal or has a cornea that is too steep, so that the light rays focus in front of the retina. Close objects look clear, but distant objects appear blurred.

Hyperopia
A hyperopic eye is shorter than normal. Light from close objects cannot focus clearly on the retina. The words on a page will seem blurry, or it will be difficult to see well enough to do close-up tasks, like threading a needle.

Astigmatism
Astigmatism distorts or blurs vision for both near and far objects. It’s almost like looking into a fun house mirror in which you appear too tall, too wide or too thin. When you have astigmatism, the cornea curves more in one direction than in the other – like a football. A normal cornea is round and smooth, like a basketball.

 

Adapted from the American Academy of Ophthalmology