What Are Progressive Lenses
The first patent for a progressive lens was obtained during the year 1907, which included the progressive lens design and the process for manufacturing the design. Nevertheless, this was no way related to the modern designs of the progressive lens system. However, the design that was patented way back in the early 21st century never came into commercialization. Varilux was the first of the lens type to exhibit a modern design and thus was developed by Bernard Maitenaz in the year 1953 and later became a part of the Essilor company in the year 1959.
Those lenses that were created during the early period were actually made of crude designs. However, modern lenses are more acceptable and there are many designs that are created to cater the needs of the individual patients. There are separate types of lenses for different applications. Say for instance, the progressive addition type lenses come with distance to intermediate or intermediate to near types that specifically work out as an occupational lens and more. Since the year 1980, there have been a variety of lenses that are manufactured to suit the various needs of the patients that are based on a wide range of mathematical modeling, which tend to increase the surface area and thus deliver enhanced design and control over the type of lens chosen.
The biggest advantage of these progressive lens systems is that, the users can adjust the power of these additional lens system based on the power that is required for a clear vision based on the different viewing distances and more. The correction location of the lens for precise viewing actually requires small adjustments of the head to the position because reading tasks require greater deals of performance when compared to the mere tasks of viewing. Also, most of the bifocal and the trifocal lens that are created today are more cosmetically attractive and thus, are designed to suit the old age needs as well.
All the more, these lenses are manufactured in a way such that they are exclusively designed to deliver a youth look and thus, make the users free from the segments or lines on the surface of the lens. They are also based on the principle of optimization which is in turn based on the concept of linearization and thus ensures the maximum delivery of the special spline advantages. Also, the power of the lens tend to increase between the high and the low power regions and thus delivers accurate power distribution that ideally suits the near and the distant vision and thus helps to decrease the number of optical aberrations that are caused. However, amidst the various advantages, there are certain disadvantages that are observed as well, nevertheless, these progressive lenses tend to serve better function and advantage.