Guide to Eyeglasses
- The invention and proper use of bifocal eyeglasses
The first pair of eyeglasses was invented in the 13th century for people to magnify objects they want to see. Using convex lenses, it was used to compromise farsightedness, which is the inability to see items nearby clearly. Later in the 24th century, nearsightedness was also correctable by using concave lenses.More...
- Progression of bifocal and trifocal lenses
Eyeglass lenses have advanced to offer more options for various vision problems. One convincing example is the invention and progression of multifocal lenses for presbyopia correction.More...
- Various types of specialty eyeglasses
Besides eyeglasses for regular wear, there are still various types of specialty eyewear or “task-specific” eyeglasses. Since one pair of eyeglasses does not fit all sizes in most cases, those specialty eyeglasses such as computer glasses, driving eyeglasses and protective glasses are helpful in specific circumstances.More...