Evolving Bifocal Glasses to Keep Up With Contacts

The United States gentleman of science, Benjamin Franklin, who endured both nearsightedness as well as presbyopia, devised bifocal reading glasses in 1784 to obviate needing to often switch betwixt 2 sets of glasses.

The first lens pair intended for correcting astigmia were manufactured by the British astronomer George Airy within the year 1825.

In the history of bifocal reading glasses, the development of pectacle 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 advised that oculars could be held in place with a ribbon passed over the subject’s head, which in turn was fastened by the weight of a hat.

Entering modern 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 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 made 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, eyeglasses stay rather common, 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 able to resist the challenges of day-to-day wear and tear as well as the occasional accident. Modern frames are also ofttimes made from robust, light-weight materials such as titanium alloys which weren’t obtainable in earlier years.