The function of sunglasses

1. Beautiful decoration, covering eye defects, visually slimming the face.
This theory was proposed by the Olsen sisters, and her theory is very simple. Women who love beauty and thinness always "deliberately" make themselves look smaller and slimmer. The larger the sunglasses worn on the bridge of the nose, the smaller their face will look, creating a visual effect of "slimming face".
2. Prevent exposure to ultraviolet rays in sunlight
Ultraviolet rays can damage the cornea and retina, and high-quality sunglasses can completely eliminate the exposure of ultraviolet rays.
3. Prevent exposure to strong light
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.
4. Prevent glare exposure
Some surfaces, such as water surfaces, can reflect a large amount of light, and the resulting bright spots can disrupt vision or hide objects.
5. Eliminate specific frequency light rays
Some frequencies of light can blur the line of sight, while other frequencies of light can enhance contrast. Cheap sunglasses filter out some of the light, causing the iris to open and receive more light while more ultraviolet rays enter, increasing the damage that ultraviolet rays cause to the retina.