If you're already making an effort to get outside, hike, play sports, take walks, et cetera, that counts towards this two-hour threshold. Now, the other behavioral protocols, which have shown to be useful in terms of maintaining or improving vision, relate to the musculature around the eye and the control of the movement of the lens. So it's not if you notice, I mean, the lens of your eyes and filled with blood vessels and capillaries because it needs light to pass through super interesting structure.

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