Myopia is a common visual deformity. It is also known as nearsightedness or short sightedness. In myopia, the eye focuses better on the objects that are nearer than the objects which are at a farther distance. In this visual disorder, a person has enlarged eyeballs or excessively curved cornea. This physiological defect alters the image formation and focus of light rays through the lens on the retina. In general, this defect occurs in school-going children when the eyeball is developing. It progresses up to 20 years of age.