Refining Eyeglass Technology

The United States gentleman of scientific discipline, Benjamin Franklin, who endured both myopia as well as presbyopia, invented bifocals in 1784 to obviate needing to frequently switch between 2 pairs of glasses.

The first lenses for rectifying astigmia were manufactured by the British astronomer George Airy in 1825.

Along the history of bifocal glasses, the building of spectacle frames also developed. Early on oculars were contrived to be either held in place with hand or by maintaining force on the nose. Girolamo Savonarola advised that oculars could be held in place with a ribbon passed over the subject’s head, this in turn 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 20th century, Moritz von Rohr at Zeiss produced 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, eyeglasses stay rather common, 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 sunglasses with bifocal lenses.

Most of these designs are also distinctly better able to resist the stresses of day-to-day wear as well as the occasional accident. Modern frames are also frequently constructed from substantial, light-weight materials like titanium alloys that were not available in earlier times.