The role of sunglasses：
1. Protection from UV rays in the sun
Ultraviolet rays can damage the cornea and retina, and quality sunglasses can completely eliminate exposure to ultraviolet rays.
2. Protection from bright light
When the eye receives too much light, it naturally contracts the iris. Once the iris has contracted to its limit, people then need to squint. If there is still too much light, such as sunlight reflected from snow, it will damage the retina. Quality sunglasses can filter out up to 97% of the light entering the eye to avoid damage.
3. Prevent glare exposure
Some surfaces, such as water, reflect a lot of light, and the resulting bright spots can disrupt vision or hide objects. Quality sunglasses can completely eliminate this type of glare using polarization technology, which we’ll cover later.
4. Eliminate certain frequencies of light
Some frequencies of light can blur vision, while others can enhance contrast. Choose the right color for your sunglasses to make them work better in a particular 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 irises to open up to receive more light. This also allows more UV rays in, increasing the damage caused to your retina by UV rays.
Therefore, there is a real difference between the various types of sunglasses. Picking the right, quality sunglasses for your particular environment will provide you with the greatest protection.