Evolution of the Bifocals
The United States gentleman of science, Ben Franklin, who persevered both myopia as well as presbyopia, invented bifocal reading glasses in 1784 to avoid needing to frequently alternate betwixt 2 pairs of eyeglasses.
The 1st lenses for rectifying astigmia were manufactured by the British stargazer George Airy in 1825.
In the history of bifocal reading glasses, the building of eyeglass frames also evolved. Early on glasses were designed to be either held in place with your hand or by maintaining force on the bridge of the nose. Girolamo Savonarola noted that eyeglass lenses could be kept in place with a ribbon passed over a person’s head, which in turn was held secure by the weight of one’s 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 creator Edward Scarlett. These designs were not instantly prosperous, however, and various styles with attached handles like “scissors-glasses” and lorgnettes stayed fashionable throughout the eighteenth and into the early nineteenth century.
In the early twentieth century, Moritz von Rohr at Zeiss produced the Zeiss Punktal spherical point-focus lens system which controlled the eyeglass lens field for many years.
Despite the improving fame of contacts and laser restorative eye surgery, spectacles stay rather common, as their technology has continued to evolve. 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 capable of resisting the rigors of everyday wear and tear as well as the occasional accident. Contemporary frames are also frequently constructed from solid, light-weight materials like titanium alloys which were not obtainable in earlier years.