The United States man of science, Ben Franklin, who endured both myopia as well as presbyopia, invented bifocal reading glasses in 1784 to obviate having to often alternate betwixt two sets of glasses.
The original lens pair designed for repairing astigmia were constructed by the British stargazer George Airy within the year 1825.
Along the history of bifocals, the building of eyeglass frames also evolved. In early stages oculars were designed to be either held in place with your hand or by maintaining force on the bridge of the nose. Girolamo Savonarola advised that oculars could be held in place with a ribbon placed over a person’s head, which in turn was fastened by the weight of one’s 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 instantly prosperous, however, and various styles with attached handles like “scissors-glasses” and lorgnettes remained 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 improving fame of contacts and laser restorative eye surgery, spectacles remain quite popular, as their engineering 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.
Many of these designs are also distinctly better able to resist the challenges of day-to-day wear and tear as well as the periodic accident. Modern frames are also frequently constructed from robust, light-weight materials like titanium alloys which weren’t obtainable in earlier times.