Selection of bifocals

Bifocals is a staple item of presbyopia correction is everywhere if optician.
And now there is a high probability that presbyopia also become young businessman to overuse the eye with PCs and mobile phones are sold in many others there is a fashion design.
But when I bought just because cheap, and good design, it is possible to repent.
As knowledge of how to choose the one that is right for you, here, I will introduce the types of bifocals.

As mentioned above, bifocal glasses has become a mechanism found in one lens both far and near.
As for bifocals and whether any of the same, it is not so in.
Bifocal glasses, there are two types of "progressive lenses" and "bifocal lens".

A bifocal lens, in which there are two degrees in the lens is a progressive lens having a frequency in the progressive lens.
Simply put, as an easy-to-understand, bifocal lens is one that has a dedicated portion of each to see the near and far in one lens, progressive lens ones that have the ability to adjust the distance of the target to see step-by-step You can be described as.

In general, is a progressive lens bifocals.
Bifocal lens has a disadvantage because of the border when viewing near and far, that looks halfway between blurry.
On the other hand, because there is no border, a progressive lens in focus at the halfway point.
Better progressive lens, but is also a good look, on the other hand there are also disadvantages.
By the frequency of the field is not visible or when things will be distorted, and look at the near or narrow.
If you do not like desk work, the people of bifocal lens looks clean.
If you choose to bifocals as a way of correcting presbyopia, it would help to get a firm such differences.