According to the purpose, it is generally divided into three types: sunshade mirror, light-colored sunglasses and special-purpose sunglasses.
Sun visor: As the name suggests, it is used for sunshade. In sunlight, people usually adjust the pupil size to adjust the luminous flux. When the light intensity exceeds the eye's ability to adjust, it will cause harm to the human eye. Therefore, in outdoor activities, especially in the summer, many people use sunshades to block the sun to reduce the fatigue caused by eye adjustment or the damage caused by strong light stimulation.
Light-colored sunglasses: the sunscreen is not as good as the sunshade mirror, but its color is rich, suitable for use with all kinds of clothing, has a strong decorative effect. Light-colored sunglasses are favored by young people because of their rich colors and diverse styles. Fashion women are more fond of them.
Special purpose sunglasses: Because it has a strong function of blocking sunlight, it is often used in beaches, skiing, mountain climbing, golf and other fields with strong sunlight. Its UV resistance and other indicators have higher requirements.