Myopia is a refractive error in which one can see nearby objects more clearly than distant ones.
This happens when the length of the eye is longer than normal or the cornea has greater refractive power so that the light rays emitted by distant objects are focused in front of the retina. The tendency for myopia can often be hereditary.
Also nearby work can affect its progress. It is mainly detected in school-aged children, can worsen during adolescence and usually stabilizes at the age of 20 years.