| glasses | Synonym: spectacles. 2. Lenses for correcting refractive errors in the eyes. (05 Mar 2000) |
|---|---|
| trifocal | Having three foci. See: trifocal lens. (05 Mar 2000) |
| trifocal lens | A lens with segments of three focal powers: distant, intermediate, and near. (05 Mar 2000) |