March 17th, 2010 | Author: admin
Bifocals Reading
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Some aspects of no-line bifocal reading
Some people may not know exactly what the no-line bifocal reading. Bifocal reading glasses have been in existence for more than two centuries since the invention of the first pair of bifocals by Benjamin Franklin. During these years many people have benefited from these creative performances. Some people may have wondered why this great man could come up with the idea of combining two different lenses in one and and obtain correction of double. Well, all the details of creation or invention of bifocals has been for many years. For most people, it is more meaningful to study other technological improvements in the following days after an invention. This is also true when it comes to reading glasses bifocals. In the long history of vision correction device, its basic design and principle has never been changed. In short, a bifocal lens always has two different powers for the correction of myopia and presbyopia correction, respectively. However, there is a breakthrough marked by the development of no-line bifocal reading. This new way of reading glasses bifocal, prepares his powers completely differently than traditional bifocals.
Most people have been very familiar with a bifocal lens design has a "negative" energy on the bottom and a "positive" power at the top. And the bottom is intended to provide the correction of presbyopia, while the remainder is used to compensate for nearsightedness. Clearly, this original design basis and involves a clear separation within a single lens. In other words, a bifocal lens has been effectively divided into two functional parts, each is a specific problem vision. Without attention and thought, everything seems fine. But in fact, almost all manufacturers of traditional bifocals to introduce a visible line decouple these two parties. Thus, a bifocal lens can actually be seen with a line in the middle or slightly lower position. The answer to the question referred to at the beginning of this article is that bifocal reading no line is without a line visible on the target. This type of bifocal lenses have additional advantages over the traditional type.
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Tags: bifocals, bifocals reading glasses, glasses, oculos, reading, stickon