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单词 θ16294
释义
the world > health and disease > healing > ophthalmology or optometry > aids to defective vision > [adjective] > types of spectacles > types of spectacle lens (6)
astigmatic1881

Of an artificial lens: correcting astigmatism.

toric1890

Of or pertaining to a torus (see torus, n. 4); having the form of a torus or a portion of one; spec. in Ophthalmology, applied to a lens with one…

trifocal1921

Of a lens: having three parts with different focal lengths. Of spectacles: having such lenses.

multifocal1928

Having or relating to several foci or a range of focal lengths.

pebble-grained1943

(a) having a pattern produced by pebbling; (b) (of a lens or spectacles) having the appearance of pebble (sense 2b).

omnifocal1962

(a) adj. designating a lens whose power changes continuously from top to bottom (cf. varifocal, adj. b); (b) n. an omnifocal lens.

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