About: http://webisa.webdatacommons.org/411991469

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 foldable lenses of the prior art has usually been all silicone or other soft pliable material, which sometimes provides for distortion at the optical zone of the center of the lens.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com