About: http://webisa.webdatacommons.org/447158470

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	It checks for blind spots due to glaucoma, retinal problems, a stroke or other ailments.How it works: You???ll cover one eye and stare straight ahead with the other.
http://www.w3.org/ns/prov#wasQuotedFrom	healthmonitor.com