Developing Better Technology for Bifocal Glasses

The American man of scientific discipline, Ben Franklin, who endured both nearsightedness as well as presbyopia, devised bifocal reading glasses in 1784 to obviate having to often switch between 2 pairs of eyeglasses.

The 1st lens pair for repairing astigmia were manufactured 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 designed to be either kept 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 the subject’s head, which in turn was fastened by the weight of one’s 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 produced the Zeiss Punktal spherical point-focus lens system which dominated the eyeglass lens field for several years.

Despite the improving fame of contacts and laser restorative eye surgery, eyeglasses stay rather common, as their technology 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.

Many of these designs are also distinctly better capable of resisting the stresses of day-to-day wear and tear and the periodic accident. Contemporary frames are likewise frequently contrived from robust, light-weight materials such as titanium alloys that weren’t obtainable in earlier days.