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Developing Better Technology for Bifocal Glasses

The United States man of scientific discipline, Benjamin Franklin, who endured both myopia as well as presbyopia, devised bifocal reading glasses in 1784 to avoid having to frequently alternate between 2 sets of glasses.

The 1st lenses designed for correcting astigmia were distributed by the British stargazer George Airy in the year 1825.

Along the history of bifocals, the building of pectacle frames also evolved. Early on glasses were contrived to be either held in place with your hand or by maintaining force on 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 a 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 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 twentieth century, Moritz von Rohr at Zeiss made the Zeiss Punktal spherical point-focus lens system which controlled the eyeglass lens field for many years.

Despite the rising fame of contacts and laser restorative eye surgery, spectacles 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 bifocal sunglasses.

Many of these modern contraptions are also distinctly better capable of resisting the challenges of day-to-day wear and tear as well as the periodic accident. Contemporary frames are also ofttimes contrived from solid, light-weight materials such as titanium alloys which were not obtainable in earlier years.

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