How Do Eyeglasses Correct Our Vision?
Eyeglasses or contact lenses work so well because they can correct refractive problems. In other words, they bend the light rays in a way that lets you see more clearly. (Refracting is a big word that means bending light rays.)
In each of your eyes there is a lens that bends the light waves entering the eye. This focuses a clear picture of what you see on a retina. (The retina is a special layer of light—sensitive cells at the back of the eye.)
Some people’s eyes cannot do this very well, and this result in blurry vision. Eyeglasses and contact lenses are extra glass or plastic lenses put in front of the eyes’ own lenses.
The eyeglasses or contacts correct the eyes with blurry vision by bending the light waves so that the picture on the back of the eye focuses sharp and clear.