Myopia or nearsightedness is a refractive error that causes poor distance vision. If your eye is too long, or your cornea has too much focusing power, images focus in front the retina.

Myopia

If you have myopia, light rays have past the correct focal point by the time they reach the retina. The retina then sends this "over-focused," blurry image to the brain. This condition affects over 25% of all people in the United States.