A recent study into the prevalence of myopia, or nearsightedness, in children and young people describes it damningly as a “global public health concern.” Researchers analyzed the results of a whopping 276 health studies involving more than 5 million people in total and found that around a third of the world is nearsighted. Myopia could affect 740 million young people by 2050. But nearsightedness is not evenly distributed around the world – not even close – and that numbers are (mostly) rising. If reading this gives you motion sickness, or if you need to take a break from your screen for 20 se…