Definitions for "BIFOCAL LENSES"
Eyeglasses that accommodate two viewing zones, one for seeing objects that are near and one for distance. Bifocal lenses may have a well-defined single visible line separating the two viewing zones, or be blended as in "no line" or progressive add lenses.
Lenses containing upper and lower segments, each with a different power.
Bifocal Lenses are useful in affording the patient 2 vision corrections. One for distance and the other reading.