Lifeguard Glasses is a pair of sunglasses specially designed for outdoor lifeguards. Compared with traditional sunglasses, the highlight of Lifeguard Glasses is to adjust the depth of the color of the sunglasses lens, while the shading performance of traditional sunglasses is not adjustable. When white clouds block the sun outdoors, the light becomes dark. In this case, wearing traditional sunglasses with strong shading performance will hinder the lifeguard's observation of the water surface. However, sunglasses with weak shading cannot effectively protect the eyes of lifeguards under strong light. Lifeguard Glasses solves this problem. The lifeguard can adjust the color of the sunglasses lens according to the intensity of the outdoor light, which can control the stimulation of the light on the eyes, so that the lifeguard can better observe the water surface by adjusting under different light.