The color of the lens can differ with fashion, but for common use, green, grey, or brown is suggested to keep away from or minimize color distortion, that could be unsafe when, for case, driving a car. The Grey lenses are considered neutral for the reason that they do not improve contrast or distort colors. The Brown and green lenses cause some minimal color distortion, but have the contrast-enhancing properties. Red lenses are excellent for medium and lower light circumstances for the reason that they are good at enhancing contrast. Orange and yellow lenses have the top contrast improvement and depth perception. That is why yellow lenses are generally used by golfers and shooters. The Blue and purple lenses give no real benefits. The Clear lenses are used primarily to care for the eyes from impact, debris, or chemicals.
Aside from the lens color, there are some sunglasses have a mirrored coating on the outer surface. This mirrored coating reflects a few of the light when it hits the lens before it is transmitted through the lens making it valuable in bright conditions. These mirrored coatings can be made any color by the maker for styling and fashion purposes. The color of the mirrored surface is inappropriate to the color of the lens. For instance, a gray lens can have a blue mirror coating, and a brown lens can contain a silver coating. These types of sunglasses are at times called mirror shades.
Other models have polarized lenses to lessen glare caused by light reflected from polarizing surfaces like water with the polarized diffuse sky radiation (skylight).Some models make use of a degradation where the top of the glass is darker and the bottom is transparent. Depending on the company, any of the above features can be combined into a set of lenses for a pair of sunglasses. Before the beginning of sunglasses, one-eyed people could wear an eye patch to not disturb other people. Few people who are severely visually impaired but still sighted wear sunglasses to protect their vision against glare.
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