Nearsightedness or myopia occurs when the cornea is too steep relative to the length of the eyeball. As light enters the eye, this causes the visual image to focus in front of the retina, resulting in a blurred or distorted view.
Myopia. A condition of the eye that most commonly results in blurred distant vision, although moderate to severe myopia may also result in blurred close vision. The cornea and lens focus light rays from a distant object in front of the retina.