(n) biconvex transparent body situated behind the iris in the eye; its role (along with the cornea) is to focuses light on the retina, Syn.crystalline lens, lens of the eye
(n) a clear plastic lens that is implanted in the eye; usually done when the natural lens has been removed in a cataract operation, Syn.interocular lens implant, IOL
n.; pl.Lenses [ L. lens a lentil. So named from the resemblance in shape of a double convex lens to the seed of a lentil. Cf. Lentil. ] (Opt.) A piece of glass, or other transparent substance, ground with two opposite regular surfaces, either both curved, or one curved and the other plane, and commonly used, either singly or combined, in optical instruments, for changing the direction of rays of light, and thus magnifying objects, or otherwise modifying vision. In practice, the curved surfaces are usually spherical, though rarely cylindrical, or of some other figure. [ 1913 Webster ]
Lenses [ 1913 Webster ]
☞ Of spherical lenses, there are six varieties, as shown in section in the figures herewith given: viz., a plano-concave; b double-concave; c plano-convex; d double-convex; e converging concavo-convex, or converging meniscus; f diverging concavo-convex, or diverging meniscus. [ 1913 Webster ]
Crossed lens (Opt.), a double-convex lens with one radius equal to six times the other. -- Crystalline lens. (Anat.) See Eye. -- Fresnel lens (Opt.), a compound lens formed by placing around a central convex lens rings of glass so curved as to have the same focus; used, especially in lighthouses, for concentrating light in a particular direction; -- so called from the inventor. -- Multiplying lensor Multiplying glass (Opt.), a lens one side of which is plane and the other convex, but made up of a number of plane faces inclined to one another, each of which presents a separate image of the object viewed through it, so that the object is, as it were, multiplied. -- Polyzonal lens. See Polyzonal. [ 1913 Webster ]
[たま, tama] (n) (1) ball; sphere; globe; orb; (2) bead (of sweat, dew, etc.); drop; droplet; (3) (esp. 球) ball (in sports); (4) pile (of noodles, etc.); (5) (esp. 弾; also written as 弾丸) bullet; (6) (esp. 球) bulb (i.e. a light bulb); (7) lens (of glasses, etc.); (8) (esp. 玉, 珠) bead (of an abacus); (9) (sl) (abbr) (esp. 玉) (See 金玉・きんたま) ball (i.e. a testicle); (10) (esp. 玉, 珠; also written as 璧) gem; jewel (esp. spherical; sometimes used figuratively); pearl; (11) female entertainer (e.g. a geisha); (12) (derog) person (when commenting on their nature); character; (13) item, funds or person used as part of a plot; (n, n-suf) (14) (See 玉子・2) egg; (n-suf) (15) (usu. だま) coin; (16) precious; beautiful; excellent; (P) #2,007[Add to Longdo]
[zakkuri] (adv, vs) (1) roughly; approximately; loosely; (2) cutting or breaking apart with vigour; (3) deeply (cut or split); (4) rough (woollens, etc., as adjectival phrase with (to)shita); (5) sound of treading on pebbles [Add to Longdo]
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