bifocal eyeglasses

bifocal eyeglasses

A corrective lens containing upper and lower segments, each with a different power. The main lens is for distant vision; the secondary lens is for near vision.
References in periodicals archive ?
One of the most versatile and gifted people in American history announced the invention of bifocal eyeglasses this month in 1785.
This statesman-scientist went on to invent the Franklin stove, bifocal eyeglasses, the lightning rod, not to mention our republic's experiment in ordered liberty.
The voucher program covers the cost of a basic pair of single or lined bifocal eyeglasses at no out-of-pocket cost to the patient.