Here are the main features of sunglasses:

1、Protects against UV damage: One of the primary functions of sunglasses is to block ultraviolet (UV) radiation. The damage of ultraviolet rays to the eyes is cumulative, and long-term exposure to the sun may lead to eye diseases such as cataracts and eye skin aging. High-quality sunglass lenses can absorb or reflect ultraviolet rays and protect the eyes and skin around the eyes.

2、Reduce eye fatigue: Under strong light or reflected light, the eyes need to constantly adjust to adapt to light changes, which may cause eye fatigue. Sunglasses can reduce light intensity and reduce the amount of adjustment your eyes need to make, thereby reducing eye fatigue.

3、Enhance visual comfort: Sunglasses can filter out dazzling sunlight, making vision clearer and more comfortable. During outdoor activities, such as driving, skiing, hiking, etc., sunglasses can improve visual comfort and help people better enjoy outdoor activities.

4、Fashion accessory: In addition to the practical functions mentioned above, sunglasses are also a fashionable accessory. They can add a sense of fashion to people's outfits and show off personal style and taste.

5、Protect privacy: In some situations, such as when participating in public events or celebrities traveling, sunglasses can also be used as a tool to protect privacy, covering the face and eyes to avoid being recognized or prying by others.

6、Reduce glare: Glare is intense light from a bright light source, such as sunlight reflecting off water or snow. This light may make people feel uncomfortable or have difficulty seeing their surroundings. The lenses of sunglasses are designed to reduce glare and improve visual clarity.

7、Color identification: Some special-purpose sunglasses, such as fishing goggles or ski goggles, have specific color lenses that can help people better identify fish in the water or obstacles in the snow.

In short, sunglasses are a practical tool with multiple functions, not only protecting the eyes from UV rays and strong light, but also improving visual comfort and fashion. When choosing sunglasses, you should choose the style and lens type that suits your needs and activity environment.