| pulpit spectacles | Spectacles, used for reading, in which the upper portion of the lenses are removed. Synonym: clerical spectacles, pantoscopic spectacles, pulpit spectacles. (05 Mar 2000) |
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| spectacles | Lenses set in a frame that holds them in front of the eyes, used to correct errors of refraction or to protect the eyes. The parts of the spectacles are the lenses; the bridge between the lenses, resting on the nose; the rims or frames, encircling the lenses; the sides or temples that pass on either side of the head to the ears; the bows, the curved extremities of the temples; the shoulders, short bars attached to the rims or the lenses and jointed with the sides. Synonym: eyeglasses, glasses. Origin: L. Specto, pp. -atus, to watch, observe (05 Mar 2000) |
| stenopaic spectacles | Opaque disks with narrow slits in the centre allowing only a minimum amount of light to enter; used as a protection against snow blindness, spectacles having opaque disks with multiple perforations used to aid vision in incipient cataract and in discrete opacities of the cornea; occasionally used as a substitute for corrective lenses or sunglasses. (05 Mar 2000) |
| divers' spectacles | Strongly convex lenses for clear vision underwater. (05 Mar 2000) |
| divided 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) |
| orthoscopic spectacles | Convex lenses with base-in prisms for close work. (05 Mar 2000) |
| telescopic spectacles | Magnifying spectacles obtained by using a convex objective lens and a concave eyepiece separated by the difference in their focal lengths. (05 Mar 2000) |
| 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) |