However, every coin has two sides. Shades sunglasses are comfortable to wear and convenient to take, but since some of the shades sunglasses are with flip-up mechanism flipping to the top of your plastic or metal frame, they are easily to get loose and fall down, and meanwhile extra weight added by the shades sunglasses would increase burden to the nose and the area around the eyes. Wearing for a long time, one will feel dizzy and painful.