There is a common phrase among the eyewear users especially the old individuals, called cheap bifocals reading glasses. First lets be clear what bifocal reading glasses are. Compared with traditional reading glasses or other regular prescription eyeglasses, bifocal reading glasses differ most considerably in the lens power. A conventional reading lens or a regular prescription lens has normally only one degree of power across the whole lens. In other words, such a lens is uniformly made with a single prescription. When it comes to a bifocal lens, it is even simple to get some information from its name. A bifocal lens has typically two powers of different kinds. It is still necessary to point out that different parts of a bifocal lens are equipped with different degrees of power.
Now, lets move to the second point that why the elderly relies on cheap bifocals reading glasses more than the young. A typical person who suffers from myopia or hyperopia will get his or her eye condition stabilized at a certain age. However, there is another eye problem that occurs only when people reach their early 40s or even 50s. It is definitely called presbyopia. Folks with this visual condition are closely associated with a classical symptom. They will find it is difficult to see things that are close up. This seems like the symptom caused by farsightedness. However, the reason behind it is totally different. Hyperopia falls into the category of refractive errors, while presbyopia is actually a natural reflection of the aging eyes.
While reading glasses are there for presbyopic people to perform near tasks only, bifocal reading glasses help them finish more tasks that both close up and distance objects will be seen clearly. This is why the old is more probably to rely on
cheap bifocals reading glasses. These bifocal lenses with two different powers can provide clear view on two vision ranges.
