Get all the ultraviolet ray-blocking power and crystal clear resolution of BluBlocker Vision with your current prescription glasses. Designed to fit larger prescription glasses. This is an ideal solution for protecting your eyesight while still looking very stylish. A simple clip-on mechanism does two things: 1) opens easily so you can clip it onto your prescription glasses and 2) allows the clip-ons to flip up should you drive under a bridge or enter into an area where you do not need sunglasses.