Causes of myopia
Myopia is due to an incorrect shape of the eyeball that is too elongated from the front to the back due to the focusing force of the cornea and lens, or because the cornea or lens (or both of these parts of the eye) are too thick or too curved along the entire length. As a result, light rays in front of the retina fall directly onto the surface of the retina. This makes distant objects appear blurry. This can cause problems in a number of activities such as face, object or distance recognition, sports, driving, and the like. Children whose one or both parents are also short-sighted are at increased risk of this disorder.