With time passing not only glasses have been developed, but contact lenses too. Today technology is advanced every year, more and more opportunities become open to everyone who is going to correct his vision. The multifocal contact lenses are the last word in the nowadays technologies. Their use is rising with every year.
Before the invention of multifocal contact lenses, people who had presbyopia hadn’t had opportunities to correct it in a proper and convenient for them way. The Franklin or Executive bifocal contacts were mostly used. They had a line, which went across the entire width of the contact lens and had only one option. The smaller, half-moon bifocal segment were below. So those people wanted to see clearly in the arm’s length distance really didn’t have good chance.
Today people who wear multifocal contacts have a lot of opportunities. Nowadays contact lenses become more and more convenient and available, besides they have a lot of advantages. Lenses are developing in the same time with the technology in other fields: today people who spend a lot of time at the computer can save their eyes with a help of special glasses, for example, also there are special contacts for distance reading or some special work, which demands some opportunities.
The great advantage of multifocal contact lenses is that you can read a newspaper and a few minutes later you can enjoy beautiful scenery behind your window without changing your contacts. These lenses let you focus your vision on different distances through the same lens. That’s why they are called multifocal contact lenses because of the different purposes of the same lens.
Bifocals
Bifocal contact lenses are the most commonly used contacts. These contacts have two powers: one for near vision and the second one for distance vision. Such lenses are mostly used to correct a distant vision and only a few for near-vision correction. But some of these lenses have no correction at all if your eyesight for distances is good enough.
The part of the lens which task is to correct your near vision can have different shapes:
• A flattop, which is like a half of the moon;
• A D-segment, which is also known as straight-top;
• A segment in the shape of a circle;
• A narrow rectangular area, which is known as a ribbon segment;
• Franklin, E style or Executive contact lenses have a half of the lens for near vision at the bottom of the contact, so to see things at distance you should look through the upper part of the lens. And to see things which are near you should focus your vision through the lower part of the lens;
Trifocal
There are also some contact lenses, which have three powers in them. Such lenses are called trifocal contact lenses and they give more opportunities to those who wear them. Trifocals have three points to focus your vision: they are usually for distance vision, near vision and intermediate vision. The advantage of these lenses is that they have the additional segment for viewing things, which appear before you in the intermediate distance. This zone is a little bit farther than the near vision zone.
For example, these contact lenses are very convenient for those people who work at the computer, because computer monitors are generally in the intermediate distance from your eyes. One more example is motorists and drivers. Their task is to see the road as well as to read the map of their rout and to see the gauges on the dashboard of their car. In this case the trifocal contact lenses have a great advantage before other contacts, because they allow seeing things in the near, intermediate and distance zone without any efforts. The most widely used trifocals are flattop or Executive contacts.
Bifocal contacts are usually placed in the same way as other contact lenses. And trifocal contact lenses are placed a little bit higher in such a way that the area for intermediate zone is on the pupil of the eye. So to see near things people who wear bifocal contacts should drop their eyes downward, and their eyes naturally try to adapt to that pat of the lens, which is used for near vision. The same principle works with the trifocal contact lenses: your eye is adapting to that part of the lens through which you are looking at some thing.
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