Bifocal glasses have two points of focus, which help people to see both things close at hand and things far away. Bifocals are used mostly by people who, according to an optometrist, have weak eyesight from both aspects. They reduce the burden from the patient, as he has to keep just one pair of glasses for both purposes, rather than keeping two. There are no worries that one pair of glasses might get lost or broken.
The most common problem of using two glasses is that if someone goes somewhere, he or she might take glasses for far sight and forget the other one for reading, or vice versa. Bifocal glasses overcome this problem, as they could be used for both purposes.
Their glass is divided into two parts, the upper part mainly for farsightedness and the lower part for reading.
H owever, there is one disadvantage of bifocal glasses. This is that they are far more expensive than single lens glasses; they are almost double at cost. But if we give a little thought to the matter, we will realize that the price is good and reasonable. For a moment, just think that you went to an outlet and asked for two pairs of glasses- one for far sight and one for reading. The retailer would show you those two glasses and on the other side, he will keep bifocal glasses. We will realize that the cost of a single frame of bifocal glasses is equivalent to, if not less than, the price of buying two prescription glasses for different purposes. Another disadvantage is that if the bifocal glasses are broken, you will lose both lenses, those for far sight and reading. If you have two separate glasses for separate purposes, only one frame of glasses will be broken while you can still use the other one.
Nowadays, people are less concerned with the breaking of glasses as the discounts provided by outlets, helping them to buy a new one without much difficulty. There is the inevitable risk of breaking the frames, either from stepping on the glasses, dropping them, or something of that nature. Frame cases have overcome this problem, making bifocal glasses still a feasible and intelligent option for people with poor vision.