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Noun

lens system - a transparent optical device used to converge or diverge transmitted light and to form images

anastigmat - compound lens or lens system designed to be free of astigmatism and able to form approximately point images

anastigmatic lens - a lens designed to correct astigmatism

camera lens, optical lens - a lens that focuses the image in a camera

compound lens - a lens system consisting of two or more lenses on the same axis

optical condenser, condenser - lens used to concentrate light on an object

contact lens, contact - a thin curved glass or plastic lens designed to fit over the cornea in order to correct vision or to deliver medication

converging lens, convex lens - lens such that a beam of light passing through it is brought to a point or focus

crown lens - a lens made of optical crown glass

concave lens, diverging lens - a lens such that a parallel beam of light passing through it is caused to diverge or spread out

eyepiece, ocular - combination of lenses at the viewing end of optical instruments

field lens - the lens that is farthest from the eye in an optical device with more than one lens

Fresnel lens - lens composed of a number of small lenses arranged to make a lightweight lens of large diameter and short focal length

intraocular lens - an artificial lens that is implanted into the eye of someone to replace a damaged natural lens or someone who has had a cataract removed

meniscus - (optics) a lens that is concave on one side and convex on the other

eyeglass, monocle - lens for correcting defective vision in one eye; held in place by facial muscles

object glass, object lens, objective lens, objective - the lens or system of lenses in a telescope or microscope that is nearest the object being viewed

optical device - a device for producing or controlling light

optical instrument - an instrument designed to aid vision