High-quality sunglasses can completely eliminate ultraviolet radiation and reduce damage to the cornea and retina caused by ultraviolet rays. When the eye receives too much light, it naturally contracts the iris. Once the iris shrinks to its limit, people then need to squint. If there is still too much light, such as sunlight reflected from snow, damage to the retina will occur. High-quality sunglasses can filter up to 97% of the light entering your eyes to prevent damage. High-quality sunglasses can completely eliminate this type of glare using polarizing technology, which we’ll cover later. Certain surfaces, such as water, reflect large amounts of light, and the resulting bright spots can distract from view or hide objects. Certain frequencies of light blur vision, while other frequencies enhance contrast. Choose the right color for your sunglasses to perform better in a given environment. If sunglasses don't provide UV protection, they will expose you to more UV rays. Cheap sunglasses filter out some of the light, causing your irises to open to receive more light. This will also allow more ultraviolet rays to enter, increasing the damage caused by ultraviolet rays to the retina. Therefore, there are indeed differences between various types of sunglasses. Choosing the right, high-quality sunglasses for your specific use environment will provide you with the greatest protection. According to international standards, sunglasses are classified as personal eye protection products. The main function of sunglasses is to block the glare of sunlight. However, international standards subdivide sunglasses into "fashion glasses" and "general-purpose glasses". The quality requirements for "fashion mirrors" in the standards are relatively low. Because the main emphasis of "fashion mirrors" is style, the wearer pays attention to decoration rather than protective function. The standard's quality requirements for "general-purpose glasses are relatively strict, including requirements for UV protection, diopter and prism power."
