About: http://webisa.webdatacommons.org/164749355

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	Lenses may be glass or silica or refractory material such as diamond or sapphire to resist erosion during use.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com