Benjamin Franklin has been credited with the invention of the bifocal as far back as 1779. Though he did not…


FL-41 Glasses VS. Blue Light Glasses
FL-41 glasses and blue light glasses have different types of tinted lenses and are used for different purposes. Fl-41 glasses…

Overview of Eyeglass Lens Materials
Beginning in the 13th century, Italian monks in Murano, Italy, created magnifying lenses from a type of quartz called Beryl.…