About: http://webisa.webdatacommons.org/272123114

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The flat-top bifocal eyeglass lens of claim 82, wherein the light absorbing compound is a photochromic compound, and wherein an amount of photochromic compound in the lens forming composition ranges from about 30 ppm to about 2000 ppm.
http://www.w3.org/ns/prov#wasQuotedFrom	google.de