Myopia

Myopia, or nearsightedness, is a type of vision in which seeing is clearer at close distances than at far. In myopia, the image of an object falls in front of the retina and is thus, out of focus. The cause of the myopia is either the length of the eyeball is too long, or the power of the cornea is too high.

Minus lenses are used to correct myopia. This brings the image backward, focusing on the retina, resulting in clear vision.

Laser refractive surgery can correct the myopia by altering and changing the curvature of cornea by making it flatter so that the rays of light can be refracted and fall exact with the retina.