About: http://webisa.webdatacommons.org/280861499

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 lens can be weighted to allow for asymmetric or aspherical treatment patterns, such as for astigmatism or other irregular shapes.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com