FRANKLIN SPECTACLES Meaning and
Definition
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Franklin spectacles, also known as split lenses or double bifocals, are a type of eyeglasses that were popularized by Benjamin Franklin. They are characterized by lenses that are divided into two distinct segments, with the upper portion used for distance vision correction and the lower portion for near vision correction. The lenses are typically constructed with a semi-circular shape, with the upper part used for viewing objects at a distance and the lower part specifically designed for reading or other close-up tasks.
The invention of Franklin spectacles revolutionized vision correction for individuals with presbyopia, a condition that commonly affects older adults and results in difficulties with near vision tasks. Franklin, who was farsighted and experienced the onset of presbyopia, found it inconvenient to switch between two separate pairs of eyeglasses to accommodate both distance and near vision. In response, he devised the design for Franklin spectacles, which allowed wearers to transition seamlessly between different visual tasks by simply adjusting their gaze accordingly.
Franklin spectacles became renowned for their practicality and convenience. Despite their simple design, these glasses were a significant advancement that improved the quality of life for those suffering from presbyopia. The Franklin spectacles set the stage for further developments in bifocal and multifocal lenses, eventually leading to the creation of progressive lenses that provide a smooth transition between different distances.
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Divided s., an early form of bifocal s. in which the lower half of the lens is for near, the upper half for distant vision.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.
Common Misspellings for FRANKLIN SPECTACLES
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Etymology of FRANKLIN SPECTACLES
The term "Franklin spectacles" originates from the name of Benjamin Franklin, a renowned American polymath and one of the Founding Fathers of the United States. However, it's worth noting that "Franklin spectacles" is not commonly used today.
Benjamin Franklin was known for numerous inventions and contributions, including advancements in the field of optics and eyeglasses. He was known to have designed a unique type of bifocal spectacles, which were later referred to as "Franklin spectacles". Franklin's bifocals featured lenses with two distinct optical powers, allowing users to have improved vision for both distant and near objects. The name "Franklin spectacles" highlights Benjamin Franklin's association with this particular eyewear design.
