How exactly does laser vision correction work?
The main function of your eye is to focus light. If you think of it as a camera, the cornea is the lens and the retina is the film. The cornea, on the surface of your eye at the front, provides most of the focusing power. In perfect eyesight, it focuses light rays precisely onto the retina at the back. Your eye’s own internal lens fine-tunes light, so you can see clearly enough to read, for instance. In perfect vision, light enters the eye through the cornea and is focused at a single point on the retina. When you have a refractive error, this means that light rays bend and don’t form a sharp focus on the retina. This is normally due to a problem with the length or shape of the eye. Any operation that corrects the focusing of the eye is called refractive surgery. Laser eye surgery is simply a form of refractive surgery that uses a beam of ultraviolet light to reshape your cornea – the transparent, curved window at the front of the eye. Adjusting the curve of your cornea allows light to
