types:

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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

condenser, optical condenser

lens used to concentrate light on an object

contact, contact lens

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, objective lens

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

Abbe condenser

a condenser having 2 or 3 lenses with wide aperture for use in microscopes

achromatic lens

a compound lens system that forms an image free from chromatic aberration

closeup lens

a photographic lens with a short focal length used to take pictures at short ranges

portrait lens

a compound camera lens with a relatively high aperture

sunglass

a convex lens that focuses the rays of the sun; used to start a fire

telephoto lens, zoom lens

a camera lens that magnifies the image

fisheye lens, wide-angle lens

a camera lens having a wider than normal angle of view (and usually a short focal length); produces an image that is foreshortened in the center and increasingly distorted in the periphery

type of:

optical device

a device for producing or controlling light