Assertion: photochromic lens | /r/CapableOf | darken on exposure
Facets:
value: to light of sufficiently high frequency
type: TRANSITIVE-OBJECT
Source sentences:
text: A photochromic lens (or transition lens, as a generic trademark from the brand name Transitions) is an optical lens that darkens on exposure to light of sufficiently high frequency, most commonly ultraviolet (UV) radiation.