crossed cylinder

crossed cylinder

[¦krȯst ′sil·ən·dər]
(optics)
A thin lens whose surfaces are portions of circular cylinders whose axes cross at right angles or obliquely.
A weak lens whose effect is equivalent to that of lenses with convex and concave cylindrical surfaces of equal curvature crossed at right angles.
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Currently the web page performs the computation for the seven most common types of contact geometry (for example, a sphere in contact with a plane or two crossed cylinders).