About: http://webisa.webdatacommons.org/160848085

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 is the improper bending of the outermost rays in that pencil of light which causes refractive errors such as myopia, hyperopia (farsightedness), presbyopia (diminished accommodative range with age) and astigmatism to be noticeable.
http://www.w3.org/ns/prov#wasQuotedFrom	altered-states.net