For the 2 percent of the population who are extremely nearsighted, an inherently weak sclera, whose fibers are not held together tightly, causes the eye to stretch.
While implantable lenses are increasing in popularity, there are still some nearsighted individuals out there who have no idea that there is help outside of the traditional eyeglasses and contact lenses.
For people who are farsighted, images come into focus behind the retina; for people who are nearsighted, images come into focus in front of the retina.
Prior to his invention around 1760, the convex and concave lenses (farsighted and nearsighted lenses respectively) were worn separately.
This drops to at most 40 percent when only one parent is nearsighted, and for 15 percent of myopic children, neither parent has myopia.