- trifocal opt.
- trifocal opt. 1. adj. трифокальный 2. noun; pl. трифокальные очки
Англо-русский словарь. — М.: Советская энциклопедия. В.К. Мюллер. 1969.
Англо-русский словарь. — М.: Советская энциклопедия. В.К. Мюллер. 1969.
trifocal — tri•fo•cal [[t]traɪˈfoʊ kəl, ˈtraɪˌfoʊ [/t]] adj. 1) opt (of a lens) having three foci 2) (of an eyeglass lens) having three portions, one for near, one for intermediate, and one for far vision 3) trifocals, eyeglasses with trifocal lenses •… … From formal English to slang
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Bifocals — are eyeglasses whose corrective lenses each contain regions with two distinct optical powers. Bifocals are most commonly prescribed to people with presbyopia who also require a correction for myopia, hypermetropia, and/or astigmatism.… … Wikipedia
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