"Photochromic Lenses" are suitable for sunny , cloudy days and night, especially for driving.
"Monochrome Lenses" is only applicable during the day.
The intelligent color-changing feature provides good light-transmittance and clear vision.
Photochromic principle: under ultraviolet light or the sun, the radiation will cause a chemical reaction that changes the lenses uniformly. (Can't change color under normal light)
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