About: http://webisa.webdatacommons.org/132938180

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http://www.w3.org/ns/prov#value	Polymethylmethacrylate (PMMA) has largely been replaced by foldable materials, most notably silicone and acrylic.
http://www.w3.org/ns/prov#wasQuotedFrom	retinalphysician.com