About: http://webisa.webdatacommons.org/324363365

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	An ophthalmic lens element according to claim 1, wherein the central zone is a zone bounded by a stepped increase in the front surface mean curvature of at least +1.5 D.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com