About: http://webisa.webdatacommons.org/149304296

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	In a usual embodiment, this concentrating layer can be manufactured by pressure forming asymmetric lenses into a glass structure of approximately 1 mm thickness or formed into glass, plastic or other transparent materials.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com