Why are some people nearsighted or farsighted or have astigmatism?
Blame it on heredity at least part of the time. The causes of refractive errors are not really known. Some researchers feel that reading at an early age may contribute to increasing nearsightedness. Some even find a link between increasing nearsightedness and intelligence. If you are nearsighted, and reading this, you may be more intelligent than average. However, this does not mean that farsighted individuals are less intelligent! Myopia = Nearsightedness or shortsightedness (the length of the eyeball, not the inability to plan ahead) An eye is nearsighted when the light rays are focused in front of the retina, rather than on the retina. Nearsighted people see near objects more easily and better than those objects farther away. In nearsightedness, light rays from distant objects are focused not onto the retina but in front of the retina. Nearsightedness occurs because the cornea and crystalline lens have excessive focusing power in relationship to the length of the eye. In general, a
