| bifocal glasses |
Glasses in which the refracting power of the lower portion differs from that in the upper portion, the lower portion being used for viewing near objects or reading, the upper portion for distant objects. SYN: Franklin glasses
출처:
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| bifocal lens |
Spectacle lens having two portions with different focusing power. The top portion is usually larger and used for distance vision while the lower portion is smaller and used for near vision.
출처: www.cf.ac.uk/optom/DownsSyndromeGroup/glossary.htm...
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| bifocal |
a lens that has two different prescriptions in the same lens (distance and near).
출처: www.douglaswilson.org/ocular_definitions.html
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