The two types of defects in the eyes are Hypermetropia and Myopia - This defect doesn't let people see far placed objects. It doesn't affect near objects. This generally happens because the ciliary muscles don't relax, which doesn't let our eyes form a clear image. Whereas, In hypermetropia, a person is unable to see nearer objects clearly whereas has no problem in seeing the faraway objects. This also has all the cures in today's world and wearing spectacles can help.