| c.gl. | correction with glasses |
|---|---|
| s.gl. | without correction without glasses |
| c | gl correction with glasses |
| glasses | Synonym: spectacles. 2. Lenses for correcting refractive errors in the eyes. (05 Mar 2000) |
|---|---|
| bifocal | Having two foci. (05 Mar 2000) |
| bifocal lens | 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 may be cemented to the lens, fused to the front surface, or ground in one-piece form; other bifocal lens's are the flat-top Franklin type, or blended invisible. (05 Mar 2000) |
| bifocal spectacles | Spectacles with bifocal lenses. See: lens. (05 Mar 2000) |
| 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
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