Concave lenses correct myopia by being thin at the ... eye is longer from the front to the back than normal, this unusual shape causes light to be focused in front of the retina instead of on ...

In a ray diagram, a concave lens is drawn as a vertical line with inward facing arrows to indicate the shape of the lens.

Short-sightedness can be corrected by placing a concave lens in front of ... hard and soft contact lenses, laser surgery to change the shape of the cornea and a replacement lens in the eye.