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Of or relating to a substance or object whose color changes on exposure to light: photochromatic glasses that darken in sunlight.

pho′to·chro′mism (-krō′mĭz′əm) n.
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The high-performance PhotoChromatic shell tailors pin brightness to current conditions and protects the extended fiber-optic coils.
This agency has determined that the Comtac ACH Single Comm Headset with the named attachments and the Smart Lens Protective Eyewear with Photochromatic Lens and black frame is the tactical hearing and eye protection system of choice.
First, a new Bright Idea fluorescent sight ring facilitates quick target acquisition, and SkyCoil Technology enhances pin brightness in even the lowest light while High-Performance PhotoChromatic Technology automatically dulls the one-piece, machined micro-grooved pins in bright light to prevent pin halo.
The PhotoChromatic shell reportedly is 80 percent tougher than on earlier models and turns color more quickly, so the pins are always just the right brightness.
I chose photochromatic lenses so I'd only need one set of glasses.
Fluorescent, pearlescent, photochromatic, and granite (speckled) specialty pigments.
I don't understand the risks of computer screens when compared to daylight, if VDUs are emitting significant UV why do photochromatic lenses not react to them?
You get a lot for your cash, including a sculpted race–fit frame, semi–mirror finish, moulded nose piece and photochromatic lenses.
Reactions (+PS49) Photochromatic lenses adapt to light conditions, giving you comfortable vision in bright light and shade.
The Munich-based ad agency used photochromatic colors that makes the book completely blank until it's put in natural sunlight after which the content gradually appears like a Polaroid picture.
Also within the PhotoReady franchise, we introduced Airbrush Mousse Makeup, which contains innovative photochromatic pigments that bend and reflect light to give a flawless air brushed appearance.
The science is similar to that of photochromatic lenses but with Magic Sky the tinted elements in the glass become aligned when an electronic current passes through.