Views: 200 Author: Site Editor Publish Time: 2020-11-28 Origin: Site
It is very difficult for people with poor vision to see objects from different distances. Now there is a kind of glasses that can solve this problem, that is progressive multifocal glasses.
If divided from the focus, the lens can be divided into single focus lenses, bifocal lenses and multifocal lenses. The most common lens is a single focus lens, which has only one luminosity. Bifocal lenses have been used by many elderly people to solve the problem of seeing far and seeing near at the same time. However, due to its major shortcomings and the gradual popularization of multifocal lenses, bifocal lenses have been basically eliminated. As a milestone in the history of lens development, multifocal lenses will also be the main direction for scientists to develop and popularize in the future, such as multifocal computer reading glasses and digital multifocal lenses.
In 1907, Owen Aves first proposed the idea of progressive multifocal lenses, which marked the birth of a completely new concept of vision correction. This special lens was inspired by the shape of the elephant's nose. The curvature of the front surface of the lens is continuously increased from the top to the bottom, which can change the refractive power accordingly. In other words, the diopter increases gradually and continuously from the far use area at the upper part of the lens until the near-use area at the bottom of the lens reaches the required near-use diopter.
On the basis of previous ideas, with the help of the new achievements of design and development provided by modern science and technology, the French Maitenaz designed the first piece of progressive glasses with a modern concept in 1951, which can be used for clinical wear. After several improvements, it was put onto the French market for the first time in 1959. Its innovation in the concept of visual correction made it win the attention of the world, and was soon extended to the European continent and North America.
With the development of computers and the application of advanced design software and instruments in the design and development of spectacle lenses, the design of progressive lenses has made great progress. The general trend is from single, hard, symmetrical and spherical far field design to diversified, soft, asymmetric and aspheric far field design. In the initial design of progressive glasses, people mainly considered the problems of mathematics, mechanics and optics. With a more comprehensive understanding of the visual system, the design of modern and future progressive glasses will pay more and more attention to the relationship between progressive glasses and physiological optics, ergonomics, aesthetics and psychophysics. Therefore, progressive computer reading glasses and progressive reading glasses with transition lenses appear.
After several major innovations, the types of progressive lenses are increasing day by day, and the number of people wearing them is increasing. In France, Germany and other developed countries in Western Europe, progressive lenses have become the preferred way of vision correction. In Japan and the United States, the wearing of progressive glasses is increasing year by year. In the Asia Pacific region and Eastern Europe, with the promotion of optometry education curriculum with progressive lens fitting as the core, more and more optometrists and optometrists regard progressive lenses as an important choice for vision correction. Moreover, people can choose focus adjustable glasses or variable reading glasses according to their own needs.
Progressive multifocal lenses are designed to provide natural, convenient and comfortable corrections for presbyopia patients. Wearing a progressive mirror is like taking pictures with a camera. After wearing it, people can not only see the distance, but also see the near and medium distance objects. So, we describe progressive lenses as "zoom lenses", which is equivalent to concentrating the functions of various glasses on one pair of glasses. With the research of "myopia development and accommodation theory", progressive multifocal lenses are gradually applied to control the development of juvenile myopia. Multifocal eyeglass lenses are especially suitable for progressive multifocal readers.
1. The appearance of progressive multifocal lenses are the same as that of single lenses, and the dividing line of degree change cannot be seen. The beauty of the lens protects the wearer's need to keep the privacy of the age, and avoids the wearer's concern of revealing the age secret due to wearing double lenses in the past.
2. The change of lens power is gradual and will not produce image jump. And it's comfortable to wear and easy to adapt to.
3. The degree of lens is gradual, and the change from farsightedness to nearsightedness is gradually increased, which will not cause eye adjustment fluctuation and is not easy to cause visual fatigue.
4. Clear vision can be obtained from all distances within visual range. A pair of glasses can meet the requirements of remote use, close use and middle distance.
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