25 October 2011

Back to the Grind

Optician neutralizing a lens on the lensometer, 1920.

Medieval optics chart: Demonstration of adjusting vertex distance and diopter power for hyperopic and myopic vision correction.

Lens grinders leaving the American Optical Factory, 1946.

Lensometer ad, 1977.

Early progressive lens design

Images courtesy of the Optical Heritage Museum