The medical term for nearsightedness is myopia. When you are nearsighted, your distance vision is blurred. Close range vision is generally clear at some near distance without correction, thus the term “nearsighted.” As with most refractive errors, nearsightedness is simply caused by the shape of the eye. In this case, the eye is longer front to back, or has a steeper curve to the front lens of the eye, the cornea. Genetic, environmental or functional factors can also play a role in the development of nearsightedness.
Nearsightedness is generally corrected with eyeglasses or contact lenses. Low to moderate amounts of nearsightedness can also be corrected by reshaping the cornea with special rigid contact lenses worn only during sleep. For adults, refractive surgery such as LASIK, or lens replacements are additional options.