• Trifocals are aimed at those people who have serious eye sight problem, especially presbyopia. These are recommended for serious sufferers of presbyopia. There is an intermediate correction that one has to get used before going on to using trifocal lenses. Most people suffering from presbyopia need correction of three things: near vision, intermediate length and distance correction. So, by correction one means that if a patient has -4 diopter, as the main problem and is given +3 reading addition, he ends up with having -1, as the power then intermediate rectification is of -2.5 diopters.



• It is easy to understand why trifocals should give you a clearer sight than bifocals. These rectify three areas instead of two and hence you have clearer sight with these.

• The modification that is done to the specs is located near the lower region of it. It is in the form of a semi circular arc. So you have the near vision rectification as well as an intermediate near the bottom part of your lens. The two are in fact clearly segregated by a line.

• Now you would clearly like to know which region is allocated to your main problem area of short sightedness. The answer is the bottom most part of your lens is the region that is assigned the correction of short sightedness.

• Just located above this region is the intermediate rectification which is a special feature of the trifocal lens. This is for objects which are neither too far nor too near. This range naturally has the shortest area under coverage but this can be remedied if needed.

• The upper most specs part is allocated for distant objects. This section can definitely be used to correct other problems that the patient may be say either hyperopic or myopic.

• Many people have presbyopia once they hit forty. It is very common. Reading glasses are generally necessary for people with this condition. It is very different from other eye sight related problem such as hyperopia or myopia because this is caused due to old age. Presbyopia cannot be stopped from occurring but it can be permanently taken care of by having Lasik surgery or by putting on reading glasses or contact lenses.

• Trifocals are the best bet against presbyopia that is available today. It helps to address all the problem areas simultaneously. There is just one spec for all needs. But many people have problem with the line of demarcation that exists in these specs. If you are such an individual it is best to use progressive lenses instead of using trifocals. Power progressive lenses or varifoclas or graduate lenses they have different names but the utility aspect is very much the same. The absence of the line demarcating and segregating the different lenses is a boon that ensures maximum comfort for the user of this lens. So you can be assured of twin benefits of comfort and greatest clarity.