Polycarbonate lenses are preferable.
The better sports eye protectors are made of polycarbonate with molded temples. DO wear sunglasses, plain or with prescription lenses, to protect the eyes against sunlight and on cloudy days to protect against ultraviolet radiation. Make certain the sunglasses specify 99 percent ultraviolet blocking capability because darkness of lenses does not mean the same thing and darker lenses are not always better. DO wear polycarbonate protection eyewear during waking hours if you have good vision in only one eye. DO turn your face away or close your eyes when spraying perfume, hair spray or deodorant.