| bifocal |
having two foci; "bifocal eyeglasses"
출처: wordnet.princeton.edu/perl/webwn
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|---|---|
| bifocal |
Bifocals are eyeglasses that have corrective lenses containing two different lens powers. They are most commonly prescribed for people with presbyopia, and who also require a distance correction for myopia or hyperopia (and often astigmatism). If correction at intermediate distances is also needed, trifocals and progressive lenses may be used. ...
출처: en.wikipedia.org/wiki/Bifocal
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| bifocal |
Having two powers in separate areas on the same lens. Usually a more positive correction toward the bottom of the lens. This second value is sometimes listed as a "push"
출처: www.geocities.com/likeglass55/glossary.html
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| bifocal |
a lens that corrects both near and distant vision by having two parts with different focusing strengths
출처: www.american-depot.com/services/resources_gl_b.asp
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| bifocal |
A lens providing both distance and near (reading) correction by mean of a segment having added power or focus.
출처: www12.mawebcenters.com/coltslaboratories/gloss.ivn...
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