A lens color guide
The color of the lens can vary depending on style, fashion, and purpose, but for general use, red, grey, yellow, or brown are recommended to avoid or minimize color distortion, which could affect safety when, for instance, driving a car or a school bus.

Black, gray, or smoke lenses are best for bright conditions- they dim the bright sunlight to ease the strain on your eyes. While the lenses do darken your vision, gray does not alter color, so everything remains the same color. Gray also makes a great lens color for driving sunglasses
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