About one-fourth of adults have myopia. Most people develop myopia between the ages of 8 to 15, although you can develop it in adulthood, or even be born with it. Myopia is largely caused by genetics. Nearwork may be an environmental cause of myopia progression. However, it is unclear as to whether near work causes myopia or if people who have eyes that naturally focus for near objects are more likely to do those activities.
Many studies also suggest that myopia is associated with intelligence.
Hyperopia or farsighted. Most people are farsighted, yet the majority of people do not need glasses. In a hyperopic eye, light is focused behind the retina. However, the eye itself can correct this focusing error by accommodating or focusing the image forward onto the retina. The crystalline lens of the eye is suspended by the zonules which insert into the ciliary muscle.