<http://webisa.webdatacommons.org/prov/84358359>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/401146091> .
<http://webisa.webdatacommons.org/401146091>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<northshore.org> .
<http://webisa.webdatacommons.org/401146091>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/401146091>	<http://www.w3.org/ns/prov#value>	"The sphere measures how near-sighted or far-sighted you are, and the cylinder is a measurement of your astigmatism." .