And presbyopia correction, Will you refer to anything in the first place.
Aging of the eye is presbyopia, presbyopia correction and refers to the way that has to improve the symptoms of presbyopia, or the possibility of improvement.
Typical to correcting presbyopia is to use glasses or contact lenses.
Because it was considered a long time ago, it is assumed that presbyopia is not cured, such as reading glasses and magnifying glass it was widely used.
Convex lens reading glasses are something that will be strong enough to force the adjustment frequency of the lens is weak.
I will be that it does not look good because they are used to see near, If you leave put your reading glasses when you look into the distance.
Was lost and the burden put on reading glasses or disconnect by this distance, with what you see, I am "bifocals".
Contact lenses made for presbyopia is what now has some features of bifocals, and now most of the contact lens manufacturers are dealing with.
Bifocals, the mechanism is the same for contact lenses in glasses.
When you look into the distance, when you see the middle distance, and when you see near, a dedicated place because it is located on each lens, it has become such a design focus.
It has features to select a subject unconsciously See brain when viewing something.
In this way, bifocals is very convenient, on the other hand there are also disadvantages.
Because you are using the visual function of the brain, there is individual variation bifocals getting used to.
Thus, there is a case to see things smoothly from the beginning is difficult.
Further, since the lens is made to be seen a variety of different distance, I like the appearance disadvantages that point also generally not crisp.
