How is the idea of "outdoor time" used for myopia control?  One
of the big surprises of recent research is the importance of how
increased time spent outdoors helps in preventing myopia. At the
present time it appears that 14 hours a week or more outdoors
are significantly effective in reducing myopia progression.  How
does increased outdoor time work for myopia control?  We don't
know. There are many possibilities and studies are under way to
help determine what is happening.      What might be gained by
outdoor activity?:   • Sun exposure with Vitamin D production
(Vitamin D is produced by the skin with the aid of sunlight.)
• Exposure to bright light releases chemicals in the retina such
as dopamine that can control growth   • Exposure to visual
opportunities for far distance vision   • Exposure to beneficial
microorganisms   • Unknown events that may be caused by being
outdoors or that often happen to people who spend time outdoors.
We do know that it is not sports or physical activity. The
benefit hap