Eyeglasses whose lenses correct for both long-and short-range vision.
Referring to lenses made with two sections which have different focal lengths, one for looking at things which are near, the other for looking at things which are far away.
In optics, eyeglasses made up of two portions, one for seeing near and the other for far distance vision. The upper part is usually used for distant vision, while the lower part is for reading or other close work. Bifocals are generally prescribed for older adults, whose eyes gradually lose the ability to see clearly at close range.
An optical lens designed with dual focal lengths, enabling corrective measures for both near and distant vision, is referred to as a “bifocal” lens. Glasses equipped with bifocal lenses accommodate visual corrections for both close-range and long-range viewing.
Having dual focal points. Bifocal eyeglasses are designed with each lens divided into two sections, one for distant vision and one for close-up vision.