Matches in DBpedia 2016-04 for { ?s ?p "An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- (a-) meaning \"without\" and στίγμα (stigma), \"a mark, spot, puncture\"."@en }
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- Astigmatism abstract "An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- (a-) meaning \"without\" and στίγμα (stigma), \"a mark, spot, puncture\".".
- Astigmatism comment "An optical system with astigmatism is one where rays that propagate in two perpendicular planes have different foci. If an optical system with astigmatism is used to form an image of a cross, the vertical and horizontal lines will be in sharp focus at two different distances. The term comes from the Greek α- (a-) meaning \"without\" and στίγμα (stigma), \"a mark, spot, puncture\".".