A cylindrical lens is a lens which focuses light which passes through onto a line instead of onto a point, as a spherical lens would. The curved face or faces of a cylindrical lens are sections of a cylinder, and focus the image passing through it onto a line parallel to the intersection of the surface of the lens and a plane tangent to it. The le...
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http://en.wikipedia.org/wiki/Cylindrical_lens
(from the article `optics`) Another commonly used optical surface is the side of a cylinder. Such surfaces have power only in the meridian perpendicular to the cylinder axis. ...
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http://www.britannica.com/eb/a-z/c/174
A lens in which one of the surfaces is curved in one meridian and less curved in the opposite meridian; e.g., a teaspoon or a football. ... Synonym: astigmatic lens. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
one with at least one nonspherical surface, used to correct astigmatism.
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http://www.encyclo.co.uk/local/21001
No exact match found.
