" 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)