The Eye Needs the Sky: Time Spent Outdoors Helps Protect Vision
You might be surprised to learn that spending time outdoors appears to help protect against nearsightedness (myopia), especially in children.
The exact mechanism isn't fully understood, but one leading theory points to bright outdoor light. Sunlight triggers the retina to release dopamine, a signal that helps slow the elongation of the eyeball, the structural change that leads to nearsightedness.
There's also a simple behavioral shift: when we're outside, we tend to look up and into the distance. This gives our eyes a break from the types of near-focus work (such as screens, reading, and close-up tasks) that are strongly linked to myopia.
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