Myopia is the most prevalent refractive error. In recent years, the age of myopia onset is becoming earlier and earlier, and the prevalence is increasing year by year. China is among regions of most myopic occurrence across the world, reulting into higher need of visional correction. The worse is complications and risks to blindness brought by myopia. According to a few investigations, myopia is the first factor against lower vision and second factor against blindness. However, the mechanism underlying myopia pathology is still yet to know. Recent epidemiologic studies revealed that increased outdoor activities reduced myopia occurrence. Insights into the mechanism underlying outdoor activites inhibiting myopia will facilitate way to prevent and/or cure myopia.
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