BIFOCALS Meaning and
Definition
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Bifocals are a type of eyeglasses or lenses that have two different optical powers within a single lens. These lenses are primarily designed to accommodate individuals who have difficulty focusing on both near and distant objects, commonly due to age-related vision problems, such as presbyopia.
The bifocal lens is divided into two distinct segments horizontally. The upper portion of the lens is typically prescribed for distance vision, while the lower segment is used for near vision tasks, such as reading or sewing. The distinct separation between the two powers allows the wearer to look through the appropriate part of the lens based on the visual task they are performing.
Bifocals were first invented by Benjamin Franklin in the late 18th century, making them one of the earliest forms of multi-focal lenses. Franklin, an American polymath, noticed that as he grew older, he needed both distance and near vision correction. By cutting the lenses in half and combining them into a single frame, he created bifocals.
Today, bifocals are commonly used by individuals suffering from presbyopia and other age-related vision impairments. The design has expanded to include other types of multi-focal lenses such as trifocals (containing three powers) and progressive lenses (a seamless gradient of powers). Bifocals remain a popular option due to their affordability and effectiveness in addressing multiple visual needs.
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Etymology of BIFOCALS
The word "bifocals" is derived from two components: "bi-" meaning "two" and "-focals" which refers to "focal points". The term was coined by Benjamin Franklin, an American polymath, in 1784. Franklin, who himself used glasses for distance and near vision, created a pair of spectacles with two different types of lenses merged together. The upper part of the lenses was designed for distance vision, while the lower part was for near vision. Thus, the term "bifocals" was formed to describe these dual-lens glasses.
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