The Role Of Sunglasses

Uv rays can damage the cornea and retina, and high-quality sunglasses can completely eliminate UV exposure.
When the eye receives too much light, it will naturally contract the iris. Once the iris has contracted to its limit, people then need to squint. If there is still too much light, such as the sunlight reflected from snow, it will cause damage to the retina. Good sunglasses filter out up to 97% of incoming light to avoid damage.
Some surfaces, such as water, reflect a lot of light, and the resulting bright spots can disrupt the view or hide objects. High-quality sunglasses can completely eliminate this glare using polarization technology, which we will describe later.
Certain frequencies of light blur vision, while others enhance contrast. Choose the right color for sunglasses, so that it gets better results in a specific environment.
If sunglasses do not provide UV protection, they will expose you to more UV radiation. Cheap sunglasses filter out some of the light, causing your iris to open up to receive more light. This will also let in more UV light, increasing the damage caused by UV light to the retina.
Therefore, there is indeed a difference between various types of sunglasses. For the specific use environment, choosing the right, high-quality sunglasses will provide you with the greatest protection.
According to the provisions of international standards, sunglasses are listed as the category of personal eye protection products. The main function of sunglasses is to block the glare of the sun. However, the international standard subdivides sunglasses into "fashion mirrors" and "general purpose mirrors." The quality requirements of the "fashion mirror" in the standard are relatively low. Because the "fashion mirror" mainly highlights the style, the wearer pays attention to the decoration, rather than the protection function. In the standard, the quality requirements for general purpose mirrors are more strict, including the requirements for ultraviolet protection, as well as the index of diopter and prism degree.