The American gentleman of scientific discipline, Ben Franklin, who endured both myopia as well as presbyopia, devised bifocals in 1784 to avoid needing to frequently alternate betwixt two frames of glasses.
The first lenses for rectifying astigmia were distributed by the British stargazer George Airy in 1825.
Along the history of reading bifocals, the development of pectacle frames also evolved. In early stages oculars were contrived to be either kept 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 reading glasses 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 rising fame of contacts and laser restorative eye surgery, spectacles remain quite common, as their engineering 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 bi-focal sunglasses.
Most of these modern contraptions are also distinctly better able to resist the stresses of everyday wear as well as the occasional accident. Modern frames are likewise frequently contrived from substantial, light-weight materials like titanium alloys that were not available in earlier days.