Guide to Bifocal Glasses | 合法醫療器材資訊網

2021年5月10日—Howdobifocallenseswork?...Bifocallensescorrectnearsightednessandfarsightednessinonepairofglasses.Thetopofthelenscontainsa ...

Changes in vision seem to go hand in hand with getting older. Presbyopia[1], a common condition that occurs in middle age, causes changes in your eye’s ability to focus. These changes often result in the need for bifocals.

Bifocals were invented by Benjamin Franklin, who solved his own vision problems by taking the lenses from his reading glasses[2] and distance glasses and cutting them in half. He then remade the cut lenses into a single pair of bifocals, with the distance lens on top, and the reading lens on the bottom.

Luckily, we’ve come a long way since Franklin’s time. There are now several types of bifocal glasses. They include: