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[http://en.wikipedia.org/wiki/Eye_care_professional Eye care professionals] most commonly correct [[myopia]] through the use of [http://en.wikipedia.org/wiki/Corrective_lens corrective lenses], such as glasses or contact lenses. It may also be corrected by [http://en.wikipedia.org/wiki/Refractive_surgery refractive surgery], though there are cases of associated side effects. The corrective lenses have a negative optical power (i.e. have a net concave effect) which compensates for the excessive positive [http://en.wikipedia.org/wiki/Diopter diopters] of the myopic eye.

[http://en.wikipedia.org/wiki/Eye_care_professional Eye care professionals] most commonly correct [[myopia]] through the use of [http://en.wikipedia.org/wiki/Corrective_lens corrective lenses], such as glasses or contact lenses. It may also be corrected by [http://en.wikipedia.org/wiki/Refractive_surgery refractive surgery], though there are cases of associated side effects. The corrective lenses have a negative optical power (i.e. have a net concave effect) which compensates for the excessive positive [http://en.wikipedia.org/wiki/Diopter diopters] of the myopic eye.

The global prevalence of refractive errors has been estimated from 800 million to 2.3 billion. The incidence of myopia within sampled [[population]] often varies with age, [[country]], sex, race, [[ethnicity]], occupation, [[environment]], and other factors. Variability in testing and [[data]] collection [[methods]] makes comparisons of prevalence and progression difficult.

The global prevalence of refractive errors has been estimated from 800 million to 2.3 billion. The incidence of myopia within sampled [[population]] often varies with age, [[Nation|country]], sex, race, [[ethnicity]], occupation, [[environment]], and other factors. Variability in testing and [[data]] collection [[methods]] makes comparisons of prevalence and progression difficult.

The prevalence of myopia has been reported as high as 70–90% in some Asian countries, 30–40% in Europe and the United States, and 10–20% in Africa. Myopia is less common in African people and associated diaspora. In Americans between the ages of 12 and 54, myopia has been found to affect African Americans less than Caucasians.

The prevalence of myopia has been reported as high as 70–90% in some Asian countries, 30–40% in Europe and the United States, and 10–20% in Africa. Myopia is less common in African people and associated diaspora. In Americans between the ages of 12 and 54, myopia has been found to affect African Americans less than Caucasians.