If you stare or look at something within two feet of you for a certain number of hours each day, your eyeball actually gets longer. The visual image then is focused in front of your neural retina, and you are becoming myopic, nearsighted. There's a beautiful set of clinical trials now where mainly in kids, if kids get outside for two hours a day, getting a lot of this UVB and blue light that we're told is so terrible for us, but they get it from sunlight,. They can reverse myopia or reduce the incidence of myopia - maybe even glaucoma.

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