Do you know Why do some people were glasses because If the eye is not exactly the right shape, or the lens cannot focus properly, you cannot form a clear image in the retina.in this case you may need to wear glasses to correct your vision. For a short-sighted person, distance object look blurred because the images forms in front of the retina. A short-sighted person can see nearby objects very clearly. For a long- sighted person, the image tries to form behind the retina, so it is blurred while the lens tries to focus on a nearby object. As people get older the lenses of their eyes grow harder and cannot change their shape to focus close up.