Trifocals are and advanced style of reading glasses. Trifocals will provide you with three vision segments, as the name suggests. You might think that it will be difficult to read through a pair of glasses with three lines etched on it, but this is actually pretty easy to get used to. You will find trifocals offer better range of vision once you have adapted to them. You can consider this similar to climbing up steps. Rather than jumping straight up to step three, it is easier to use step two. The three areas of correction are designed ot reduce strain and relax your eyes into clear visoin.
Most doctors will prescribe trifocals over bifocals for advanced cases of presbyopia. If your eye doctor suggests them you will benefit from the near, intermediate, and distance correction. There are complicated calculations to tell you what your net optical power is going to be. Optical power is measured in a special unit called diopter.
Bifocals can offer correction only at two ranges of distance, that is to say, near vision or distance vision. Trifocals will offer a wider range of vision correctoin and corrected distances. Because of this, trifocals is the optimal choice in clarity for a majority of advanced presbyopes.
Trifocals are not right for everybody, they work best for people who have vision challenges in multiple areas. They are designed for more advanced cases of presbyopia. It is the intermediate segment of a trifocal lens that takes some people a little time to get used to. For instance, if you have a power of -4 diopters and a correction of 3 units, you end up with a power of -1. The intermediate vision correction will be -2.5.
o Even a lay person can understand why you get distinctly better vision with trifocals rather than bifocals. They give you three areas of correction, like a bifocal but with built in intermediate vision.
The top portion of the lens will have distance correction, so to see clearly at near simply gaze downward through the lower portion of the lens. The shape of the etched line will be that of a semi circular arc. The near and intermediate portion of a lens is clearly etched with a line.
o The problem of short sightedness is dealt with by a special region near the bottom of the lens. A good optician will fit the eyeglasses and lenses so adaptation is a breeze.
The section that corrects intemediate vision is directly above the full near vision correction. This won’t cover a great range of distance, but will enable you to see clearly those things which are not near and not very far off either.
One pair of trifocals is often all an advanced presbyope needs to read, work, and enjoy good vision. You may find yourself unsatisfied with the line markings that split the varying optical areas of the lenses. If adapting to the lined lenses is an issue or you just don’t like the way they look get progressives. They will work just as well as trifocals. Many people find progressives to be the most comfortable because there are no lines or jumps, just an even blend of correction. With them, you will enjoy optimal clarity and comfort through your eyeglasses.