| Franklin spectacles | An early form of bifocal spectacles in which the lower half of the lens is for near vision, the upper half for distant vision. Synonym: divided spectacles. (05 Mar 2000) |
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| lid crutch spectacles | Spectacles with little offsets of metal with smooth edges which engage above the upper eyelid and keep it raised above the pupil in cases of paralytic blepharoptosis. Synonym: Masselon's spectacles. (05 Mar 2000) |