Sunglasses: The sun finally has its hat on, so it might have been this that has prompted a question about sunglasses. One reader is concerned that wearing sunglasses can cause night blindness, but he's also heard that not protecting the eyes from the sun can lead to cataracts. So what should he do?
It's true that medicine is concerned that UV light causes cataracts, although most sunglasses block UVA and B spectrum light as well.
It's been posited that the brain needs full-spectrum sunlight to stimulate the pathways and organs in the brain, and some specialists have found that sunglasses affect the eyes' natural reflexes and interfere with vital biological interactions.
So what's the answer? As usual, it's to be found in the question. It is important to protect the eyes but, like the sun, put your hat on.