What are the causes of myopia?

Uzman Doktor Emil Yusifov
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Nearsightedness (myopia) is a common vision condition in which near objects appear clear, but objects farther away look blurry. It occurs when the shape of the eye - or the shape of certain parts of the eye - causes light rays to bend (refract) inaccurately. Light rays that should be focused on nerve tissues at the back of the eye (retina) are focused in front of the retina.
Nearsightedness usually develops during childhood and adolescence, and it usually becomes more stable between the ages of 20 and 40. Myopia tends to run in families.
A basic eye exam can confirm nearsightedness. You can compensate for the blurry vision with eyeglasses, contact lenses or refractive surgery.

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There is some useful information here but the causes of myopia were not addressed as stated in the title.