How Modern Bifocal Reading Glasses Came to Be
The American man of science, Ben Franklin, who persevered both myopia as well as presbyopia, devised bifocals in 1784 to obviate having to frequently alternate between 2 sets of eyeglasses.
The first lenses designed for correcting astigmia were distributed by the British stargazer George Airy within the year 1825.
In the rich history of bi focal reading glasses, the development of pectacle frames also evolved. In early stages glasses were contrived to be either held in place with your hand or by maintaining force on the nose. Girolamo Savonarola advised that eyeglass lenses could be held in place with a ribbon passed over a person’s head, which in turn was held secure by the weight of a hat.
Entering modern bifocal history, the contemporary fashion of bifocal spectacles supported by temples passing over the ears, was produced in 1727 by the British lens maker Edward Scarlett. These designs were not at once prosperous, however, and assorted styles with attached handles like “scissors-glasses” and lorgnettes stayed fashionable throughout the eighteenth and into the early nineteenth century.
In the early 20th century, Moritz von Rohr at Zeiss made the Zeiss Punktal spherical point-focus lens system which controlled the eyeglass lens field for several years.
Despite the improving fame of contacts and laser restorative eye surgery, spectacles remain quite popular, as their technology has continued to improve. For example, it’s currently possible to buy frames constituted of special memory metal alloys that return to their correct configuration after being bent. Other frames have spring-loaded hinges.
Glasses have come a long way, haven’t they? In fact, today you can even buy rimless bifocals.
Most of these designs are also distinctly better able to resist the stresses of day-to-day wear and tear and the periodic accident. Modern frames are also frequently made from substantial, light-weight materials like titanium alloys which were not available in earlier times.