Nearsightedness is at epidemic levels

This article was originally featured on The Conversation. Myopia, or the need for corrected vision to focus or see objects at a distance, has become a lot more common in recent decades. Some even consider myopia, also known as nearsightedness, an epidemic. Optometry researchers estimate that about half of the global population will need corrective lenses to offset myopia by 2050 if current rates continue–up from 23% in 2000 and less than 10% in some countries.

In another paper, from 2012, researchers conducted a meta-analysis of seven studies that compared duration of time spent outdoors with myopia incidence. They also found that more time spent outdoors was associated with lower myopia incidence and progression. The odds of developing myopia dropped by 2% for each hour spent outside per week. Other researchers have reported similar effects and argued for much more time outdoors and changes in early-age schooling to reduce myopia prevalence.

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