Great alternative to pricey prescription sunglasses. Simply clip these on to your regular prescription glasses or readers to make yourself a pair of sunglasses. Protective coating keeps the clip in place without scratching up your glasses. The flip up design makes it easy to switch between your glasses and sunglasses. Polarized lenses block glare and provide 100 percent UV protection. Ideal for activities like fishing. Entire sunglass shield measures approximately 136mm wide. The lenses measure 57mm wide and 37mm tall. Bridge measures 13 mm.