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E-book Updates on Myopia : A Clinical Perspective
Myopia has become a significant global public health and socioeconomic problem [1–4]. East Asia, and other parts of the world to a lesser extent, has been faced with an increasing prevalence of myopia [5, 6]. The prevalence of myopia and high myopia (HM) (the definition of myopia and HM is spherical equivalence (SE) of −0.50 diop-ters (D) or less and SE −5.00 D or −6.00 D, respectively) in young adults in urban areas of East Asian countries has risen to 80–90% and around 20%, respectively [7, 8]. According to a summary of 145 studies regarding the global prevalence of myopia and HM, there are approximately 1950 million with myopia (28.3% of the global pop-ulation) and 277 million with HM (4.0% of the global population), and these numbers are predicted to increase to 4758 million (49.8% of the global population) for myopia, and 938 million (9.8% of the global population) for HM by 2050 [9].The prevalence of childhood myopia is substantially higher in urban East Asian countries (49.7–62.0% among 12-year-old children) [7, 10] compared with other countries (6.0–20.0% among 12-year-old children) [9]. Similarly, in teenagers and young adults, the prevalence of myopia is higher in East Asian countries (65.5–96.5%) [8] compared with other countries (12.8–35.0%) [9]. However, the geo-graphic difference of myopia prevalence in older populations is less than that in younger populations. The prevalence rates of myopia in adults in urban East Asian countries are only slightly higher than in Western countries.
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