Bifocals for eyesight

The continuous development of medical technology allows millions of people around the world to restore lost vision and lead a full-fledged lifestyle. One of the well-proven ways to get away from presbyopia, which occurs with age in most people, is the use of two or more pairs of glasses. Of course, this is not always convenient, and here come to the rescue bifocal glasses, which combine the properties of two pairs.

Usually the upper half of the glass in such glasses allows you to see clearly the removed objects, and the bottom one - to distinguish objects that are near. Such glasses in glasses can be more, then bifocal glasses can become trifocal or even multifocal.

The idea of their creation was suggested by nature itself, some types of fish have bifocal vision, which makes it possible to see objects on the bottom of the pond well and at the same time closely monitor the approach of predatory birds from above. It is believed that the first bifocals was invented by Benjamin Franklin, who combined two pairs of glasses in one.

An interesting development of this idea was offered by a scientist from Israel Zeev Zalevsky, who combined glass in such a way that bifocals were much more convenient to use. His glasses do not have a sharp border between the glasses. The light reflected from distant and near objects is focused into one continuous stream, which covers the entire retina of the eye. This allows you to see all objects equally well. In these glasses, eyes are less tired, and for adapting to them it will take less time.

When testing them, an interesting feature was noted. It turned out that they can correct both visual defects. That is, these glasses can not only cope with this age-related ailment, they are very useful for preventive purposes.

The development of high technologies also provides additional opportunities in the development of the issue of preservation of vision. Bifocals are now being developed in their electronic version. In this case, between the two panes, a liquid crystal screen is inserted, which transmits the image to us.

In the case of an electronic version of bifocals, developers are faced with the task of increasing image quality. Interesting and the options for new items to increase or decrease the image, as well as autofocusing. The first prototypes were provided by PixelOptics, which does not stop research in this area.

After consultation at the attending physician you can buy bifocals. The price for them varies depending on the manufacturer's firm and the quality of the goods. But the main thing in this issue is the correctly chosen parameters of such glasses. This depends on the final adaptation time, which can take up to ten days from the time of use.

If you are working longer with objects that are located near, then the bottom glass should be larger than the upper one. And, accordingly, when working with distant objects, buy glasses with a larger area of the upper windows. This will help you quickly adapt to the novelty and lead a full-fledged lifestyle.