About: http://webisa.webdatacommons.org/271560282

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	A lens is a portion of a transparent refracting medium bounded by two spherical surfaces, generally spherical or cylindrical or one curved and one plane surface.
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com