the icicle of damocles
Sunglasses prevent your eyes from sensing sunlight. The more your eyes sense sunlight, the more your body/skin metabolizes Vit D from sunlights. Vit D is very important for the proper functioning of your body.

There's a good basis to your anecdotal observation.

Seafood is a good substitute for non-supplement source of Vit D during the winter months. Apparently the Inuit have kept their dark skin, evolutionarily speaking, because they so much fish.
--The_Lex Sun Mar 22 12:51:46 2009

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