As technology has advanced, our eyeglasses lenses have improved greatly in these years just as glasses fashions have changed a lot, in the old days, the most popular eyeglasses are those single vision Rx and reading eyeglasses, some guys who are both suffered from myopia and hyperopia even need to prepare two pairs along with them and switch them at different circumstance, but nowadays, we have multifocal eyeglasses, such as bifocal and progressive ones, these options become available in today’s local market and online sites!
How do you know about Franklin or Executive bifocal? They are both used for people with presbyopia who needed a correction to see close-up items, these eyeglasses lens has a line that goes all the way across the entire width of the lens, but different kinds have different shape of reading areas, here I listed 4 kinds:
1.Franklin bifocals, which has a full bottom half of a lens, are as known as executive or E style;
2. Round shape, which is really common, is one of the most kinds in bifocals you have ever saw in public;
3. Ribbon segment, which was a narrow rectangular area;
4. D segment, not as common as round segment. It is also called half-moon shape, flat-top or straight-top.
These kinds of lenses are used for people who need some visual correction in order to read or see things close-up, as they enter middle age and develop near vision problems, bifocal eyeglasses are necessary because people’s arms “become shorter” , this phenomenon associated with presbyopia, however, you can find today’s multifocal wearers have lots of options, progressive (no-line focal eyeglasses) ones are not only used for both distance and near vision, they are also available for computers and other tasks that take place at the intermediate range, and if you like, they can be ordered in special combinations for unique work situations.
For people who need to wear multifocal eyeglasses at the first time, I suggest they can choose progressive eyeglasses, as ordinary bifocal lens has a line in the lens, and there’s no transitional area compared to progressives, people will feel hard to adjust to such lenses, especially when doing sports or wearing them up and down stairs, progressive ones can avoid sequelae which is caused by glaucoma and retinal diseases. And they also can achieve the effect of control short-sighted, mitigate the myopia, easy eye fatigue, by reducing the pressure of focus when you look through the lens either, as it contains two or more different kinds of Rx power!
