Myopia treatment 'smart glasses' from Japan to be sold in Asia
Ask yourself, how much brighter is it outside than inside (assuming a sunny day vs a brightly lit office)?<p>Before looking into this, I would have guessed 2X or 3X, but would you believe it's actually over 100X!<p>I bet most people's guess would also be off by 1 or 2 orders of magnitude.<p>Even outdoors in the shade, it is over 50X brighter than indoors.<p>(For specific numbers and comparisons, see: <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6656201/" rel="nofollow">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6656201/</a> )<p>Apparently, our eyes adjust so quickly to the difference that we have a very poor sense of the magnitude of light change between indoors and outdoors.<p>I bring this up because one of the largest factors in myopia development appears to be outdoor light exposure in childhood.<p>Genetics are likely a factor too, but light exposure seems to have a huge effect: 
"The prevalence of myopia in 6- and 7-year-old children of Chinese ethnicity was significantly lower in Sydney (3.3%) than in Singapore (29.1%), while patterns of daily outdoor light exposure showed that children living in Singapore were exposed to significantly less daily outdoor light than Australian children." (from the same study linked above)<p>The obvious takeaway for parents, schools, and governments: ensure your children have plenty of outdoor playtime. It will greatly reduce instances of myopia (not to mention the benefits from higher Vitamin D levels, exercise, etc).