About: http://webisa.webdatacommons.org/310992333

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	They are available for all types of refractive errors, including astigmatism.
http://www.w3.org/ns/prov#wasQuotedFrom	healthcommunities.com