The increased exposure to daylight probably leads to higher levels of vitamin D and in some people supplemental vitamin d may help nearsightedness. About 5 years ago I found my vitamin D was rather low so I started taking a vitamin D supplement and after a couple of years my vision changed from 20/80 to 20/30 . But if I skip the vitamin D for a month or so my vision gets worse.
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The increased exposure to daylight probably leads to higher levels of vitamin D and in some people supplemental vitamin d may help nearsightedness. About 5 years ago I found my vitamin D was rather low so I started taking a vitamin D supplement and after a couple of years my vision changed from 20/80 to 20/30 . But if I skip the vitamin D for a month or so my vision gets worse.