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“bifocal lenses”
A lens used in cases of presbyopia, in which one portion is suited for distant vision, the other for reading and close work in general: The reading addition of a bifocal lens may be cemented to the lens, fused to the front surface, or ground into a one-piece form.
Other bifocal lenses are the flat-top Franklin type, or blended invisibly.
This entry is located in the following units:
bi-, bin-, bino-, bis-
(page 3)
focus-, foci-
(page 1)
lenti-, lent-, lens- +
(page 1)