A pair of sunglasses looks very simple, that is, there are two colored glass or plastic pieces in a certain plastic or metal frame. Is there anything simpler than this? In fact, two glass lenses can make a lot of differences, and these differences can have a huge impact on you when you use sunglasses.

Ultraviolet rays can damage the cornea and retina, and high-quality sunglasses can completely eliminate ultraviolet rays.

When the eye receives too much light, it naturally contracts the iris. Once the iris has contracted to its limit, then people need to squint. If there is still too much light, such as sunlight reflected from snow, it will damage the retina. High-quality sunglasses filter out up to 97% of incoming light to avoid injury.

Some surfaces, such as the water surface, can reflect a lot of light, and the bright spots generated in this way can disturb sight or hide objects. High-quality sunglasses can completely eliminate this kind of glare using polarized technology. We will introduce polarized technology later.

Some frequencies of light blur the line of sight, while others increase the contrast. Choose the right color for your sunglasses to get better results in your specific environment.

If sunglasses do not provide UV protection, it will expose you to more UV rays. Cheap sunglasses filter out some of the light, causing your iris to open up to receive more light. This will allow more UV rays to enter and increase the damage caused by UV rays to the retina.

Therefore, there is indeed a difference between various sunglasses. According to the specific use environment, choosing the right and high-quality sunglasses will provide you with the greatest protection.

In accordance with international standards, sunglasses are listed as personal eye protection. The main function of sunglasses is to block the glare of the sun. However, international standards subdivide sunglasses into "fashion mirrors" and "general purpose mirrors". The quality requirements for "fashion mirrors" are relatively low in the standard. Because "fashion mirrors" mainly focus on style, the wearer focuses on decoration, not protection. In the standard, "the quality requirements for general-purpose lenses are stricter, which include requirements for UV protection, as well as refractive index and prism power.