Assertion: spectacle's lense | /r/CapableOf | use photochromism
Facets:
value: to go to a darker state
type: PURPOSE
Source sentences:
text: A number of sunglass manufacturers and suppliers including BIkershades, Tifosi, Intercast, Oakley, Serengeti Eyewear, and Persol provide tinted lenses that use photochromism to go from a dark to a darker state.