From Benjamin Franklin to Rimless Bifocal Sunglasses
The American man of scientific discipline, Ben Franklin, who persevered both nearsightedness as well as presbyopia, invented bifocal reading glasses in 1784 to obviate having to often switch betwixt two frames of glasses.
The 1st lens pair intended for rectifying astigmia were manufactured by the British astronomy expert George Airy in 1825.
Along the history of bifocals, the building of pectacle frames also progressed. Early on oculars were designed to be either kept in place with your hand or by keeping force on the bridge of the nose. Girolamo Savonarola noted that oculars could be kept in place with a ribbon placed over the subject’s head, which in turn was held secure by the weight of a hat.
During recent bifocal history, the contemporary fashion of bi focal reading glasses 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 several years.
Despite the rising fame of contacts and laser restorative eye surgery, spectacles remain quite popular, 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 bifocal sunglasses.
Most of these modern contraptions are also distinctly better able to resist the stresses of everyday wear and tear as well as the occasional accident. Modern frames are likewise frequently contrived from substantial, light-weight materials such as titanium alloys that weren’t available in earlier years.
