From Benjamin Franklin to Rimless Bifocal Sunglasses
The United States gentleman of science, Benjamin Franklin, who endured both myopia as well as presbyopia, invented bifocals in 1784 to avoid needing to often switch between two frames of glasses.
The 1st lens pair for rectifying astigmia were constructed by the British astronomy expert George Airy in the year 1825.
In the history of bifocal reading glasses, the development of eyeglass frames also evolved. Early on oculars were contrived to be either held in place with your hand or by maintaining force on the bridge of the nose. Girolamo Savonarola advised that eyeglass lenses could be held in place with a ribbon placed over the subject’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 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 produced the Zeiss Punktal spherical point-focus lens system which controlled the eyeglass lens domain for many years.
Despite the rising fame of contacts and laser restorative eye surgery, eyeglasses remain rather 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 modern contraptions are also distinctly better able to resist the challenges of day-to-day wear and tear as well as the periodic accident. Contemporary frames are likewise ofttimes constructed from robust, light-weight materials such as titanium alloys that weren’t available in earlier days.
