The Jefferson filters blue light from your devices easing eye strain. Many people are on phones, tablets and computers for many hours a day. These devices emit blue rays that are not good for our eyes. When you use blue blocking glasses you will give your eyes a much needed break. The Jefferson comes in beatiful translucent tan, translucent gray and clear. Frame Measurements: 5 1/2" x 1 7/8" (temple to temple x height of lens)