It has long been recognized that when the sun is particularly strong, the eyes will be irritating, and the reduction of light through the colored lenses can reduce this feeling of discomfort, so the concept of sunglasses has long been known. With the development of science and people's understanding of nature, the concept of eye safety is generally recognized and applied. For example, children often damage their eyes because of their broken personality. Therefore, many countries stipulate that they need to match It is the responsibility of the physician to recommend PC lenses when the child wearing the glasses is being tested.