About: http://webisa.webdatacommons.org/345445248

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	by the degree of accuracy in such variables as air pressure, physical alignment of the instrument to the cornea, and measurement of corneal deformation.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com