The Function Of Sunglasses

Ultraviolet rays can damage the cornea and retina, and high-quality sunglasses can completely eliminate the exposure of ultraviolet rays.
When the eye receives too much light, it naturally contracts its iris. Once the iris contracts to its limit, people then need to squint. If there is still too much light, such as sunlight reflected from snow, it will cause damage to the retina. High quality sunglasses can filter out up to 97% of incoming light to avoid injury.
Some surfaces, such as water surfaces, can reflect a large amount of light, and the resulting bright spots can disrupt vision or hide objects. High quality sunglasses can completely eliminate such glare using polarization technology, which we will introduce later.
Some frequencies of light can blur the line of sight, while other frequencies of light can enhance contrast. Choose the right color for sunglasses to achieve better results in specific environments.
If sunglasses do not provide UV protection, they will expose you more to UV radiation. Cheap sunglasses filter out some of the light, causing your iris to open to receive more light. This will also allow more ultraviolet rays to enter, increasing the damage that ultraviolet rays cause to the retina.
Therefore, there are indeed differences between various types of sunglasses. Choosing suitable and high-quality sunglasses for specific usage environments will provide you with maximum protection.
According to international standards, sunglasses are classified as personal eye protection products. The main function of sunglasses is to block out harsh sunlight. However, international standards further subdivide sunglasses into "fashion glasses" and "general purpose glasses". The quality requirements for "fashion mirrors" in the standard are relatively low. Because fashion mirrors mainly highlight style, wearers focus on decoration rather than protective function. The quality requirements for general purpose mirrors in the standard are relatively strict, including requirements for UV protection, refractive index, and prism degree.