These conditions are caused by the shape of the eyeball, which changes as people get older. But you can have either condition regardless of your age, a lot of it is based on family medical history.
Nearsighted eyes, or myopia is caused when the eyeball is too long. The light rays focus in front of the retina causing images at further distances to become blurry. The nearsighted person can see...
Farsightedness is when your vision is good at seeing distances, but needs correction to see clearly the things that are close to you. Nearsightedness is when your vision is good at seeing things that...