The ColorVision lens enhances colors. Reds appear very red, blues appear very blue and all the colors in between appear vibrant and alive. ColorVision blocks all the UV light and the harmful blue light. This pair has a thin black metal rim. The clip-on mechanism opens easily so you can clip it onto your prescription glasses and it flips if you are in an area where you do not need sunglasses. Measures top to bottom 2 1/4" and side to side 2 1/2".