Evolution of the Bifocals

The United States gentleman of science, Benjamin Franklin, who endured both myopia as well as presbyopia, devised bifocals in 1784 to obviate having to often alternate between 2 frames of eyeglasses.

The first lens pair designed for correcting astigmia were constructed by the British astronomer George Airy in the year 1825.

In the history of bifocals, the development of pectacle frames also progressed. Early on glasses were designed to be either kept in place with your hand or by maintaining force on the bridge of the nose. Girolamo Savonarola noted that oculars could be held in place with a ribbon passed over a person’s head, which in turn was held secure by the weight of one’s hat.

During recent bifocal history, the contemporary fashion of bifocals 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 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 field for several years.

Despite the improving fame of contacts and laser restorative eye surgery, eyeglasses remain quite popular, as their engineering 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 bi focal sunglasses.

Most of these designs are also distinctly better able to resist the stresses of everyday wear and tear and the occasional accident. Modern frames are also frequently contrived from robust, light-weight materials like titanium alloys that weren’t available in earlier days.