FRANKLIN GLASSES Meaning and
Definition
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Franklin glasses, also known as bifocal lenses or Franklin bifocals, are a type of corrective eyewear designed to assist individuals suffering from presbyopia, a condition that causes difficulty in focusing on objects up close. Named after their inventor Benjamin Franklin, these glasses feature lenses with two distinct optical powers. The upper portion of the lens corrects vision for distances, while the lower part provides magnification for close-up work.
The invention of Franklin glasses revolutionized the field of vision correction. Prior to their creation in the late 18th century, individuals needing both distance and near vision correction had to carry and switch between multiple pairs of single-vision spectacles. However, Franklin's innovative design combined the two prescriptions into a single lens, eliminating the need for constant switching. The upper portion of the lens helps with tasks such as driving, reading signs, or watching television, while the lower part aids in reading, sewing, or using electronic devices.
Typically, Franklin glasses feature a visible line separating the distance and near prescriptions on the lens, allowing the wearers to easily determine the correct part of the lens for each particular task. However, modern variations of bifocal lenses, such as progressive lenses, have been developed to provide a smoother and more seamless transition between the different prescriptions.
Franklin glasses remain a popular option for individuals experiencing presbyopia, offering convenience and versatility in a single pair of eyeglasses.
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Bifocal glasses, in which the lower half lens is for near, the upper half for distant vision.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
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Etymology of FRANKLIN GLASSES
The term "Franklin glasses" is derived from the name of Benjamin Franklin, one of the Founding Fathers of the United States, who is often associated with the invention of bifocal glasses. Benjamin Franklin was known for his explorations and experiments in various fields, including optics. Although he did not technically invent bifocal glasses, he popularized their use. Franklin himself required glasses for both reading and distance vision. He had the lenses cut in half horizontally, with the top half for reading and the bottom for distance, which allowed him to avoid the hassle of constantly switching between different pairs of glasses. Thus, these glasses came to be associated with him, and eventually became known as "Franklin glasses".
Similar spelling word for FRANKLIN GLASSES
