No sunglasses?

Has anyone else heard of not using sunglasses? I was talking to a friend recently who has gone full granola, and she said your eyes tell your skin how to respond to the sun and that wearing sunglasses can impact your ability to produce vitamin d and prevent your skin from knowing how to respond to the sun. It sounds like BS to me, especially because she heard it on a podcast, but I’m wondering if anyone else has heard of this and knows if there’s any legitimacy?