Physics Classroom]. This vision problem is corrected by a converging lens placed in front of the eye to increase the power of it. One more vision problem that is common is astigmatism. This vision defect has to do with the eye's focus. The focus is usually not equal, and the cornea can have an odd shape or even problems with the retina. So that being the case their eye will produce images at locations with different distances. Astigmatism patients usually have a spectacle and is another common vision problem. Nowadays vision can be treated much easier. There are a few treatments or solutions to each of these vision defects. What has always been one solution was glasses but today