Bifocal Sunglasses

You may be not strange with bifocal glasses, whose top lens is for distant view while the lower lens for reading, but do you know what bifocal reading sunglasses are? Obviously, according to the denotative meaning, it is not hard to get that bifocal reading sunglasses is a combination of bifocal glasses and sunglasses, which are both able to help people read and stop ultraviolet radiation.