Myopia can also be the result of a cornea that is too curved for the length of the eyeball or a lens that is too thick. For some people, their myopia may be caused by a combination of problems in the cornea, lens, and length of the eyeball.
If you are nearsighted, you typically will have difficulty reading road signs and seeing distant objects clearly, but will be able to see well for close-up tasks such as reading and computer use.
Other signs and symptoms of myopia include squinting, eyestrain and headaches. Feeling fatigued when driving or playing sports also can be a symptom of uncorrected nearsightedness.
Nearsightedness can be corrected with glasses, contact lenses or refractive surgery such as LASIK.