When light of a certain length penetrates the eyes, the brain realizes that it is sunny outside. The brain then sends a command to produce special substances in the skin, cholecalciferols, which protect the skin from UV damage, as well as contribute to the production of vitamin D. But if a person wears sunglasses 😎 all of the above processes are blocked. After all, the brain no longer knows that it is sunny outside. As a result, a person burns quickly in the sun and gets vitamin D deficiency.
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