11 April 2011

What Is the Difference Between Bifocal With Line and Progressive Eyeglasses? Should You Switch?

The type of glasses is the most appropriate to decide, consider several factors. And one of the most common discussions on the debate which is better, with glasses line Bifocal or progressive lenses.For a better analysis, it would be a good idea to establish first their attributes, strengths and weaknesses, so that we can better compare and reach a clear conclusion.DescriptionBifocals have 2 types of optical powers, primarily used to solve the problems of myopia, hyperopia or astigmatism. The power of the lens on the top is a distance while the bottom is close-viewing capacity (e.g., read) often, bifocal lenses have a bright line on the lower part of the lens which is used when reading. The D-segment, which resembles a halfpipe upside is one of the most common types of bifocals.Progressive improve the capabilities of bifocal lenses when it display capabilities. They are also called lenses no-line bifocals because they are not lines that differentiate near and distant vision. Progressives have a "middle" area, which is created for the Visual function address to average.Benefits of the progressives on BifocalsProgressives do not require the visible line separating the distant and display near the powers, which means that the usual "swim or image jump" is avoided. You see, when switching to visualize a distant subject to a very narrow with Bifocal lenses, the displacement of distance visual often results in a disruption of normal flow of vision, which can be annoying and can even have negative impact on your eyes due to the strain it causes. Also, the limited number of power of the lens of traditional bifocal lenses, depth of focus is limited. To see things clearly, a specific range must first determine because subjects outside of distances covered by the bifocals powers will be blurred.Progressive lenses mimic features of natural visualization of eyes before it acquired its current problems, such as presbyopia. With the help of 3 glasses, it provides a transition smoothly between the powers different eye resulting in a clearer vision on all the beaches of the distance. Another thing to note is that when you use progressive, the need to adapt or move your head from top to bottom just to adapt to the computer screen is avoided.Progressive lenses of today certainly improved his predecessors. For example, the area of the lens of field of vision for the used computer has increased, eliminating the need to adjust the position of the head just to see an object clearly. Also, modern progressives are more compatible for this "active" lifestyle as it is much more comfortable to use. Devices aberrations and "swim" issues have also improved over previous models. In the past, progressive lenses of frames required relatively large due to the increase in the number of the powers of the lens. Today, compact models are feasible because of the advances in technology resulting frames more fashionable and the best qualities of facial features.Knowing what you need, it is the first step in deciding what type of sunglasses purchase. At a lower price, traditional bifocal lenses provide vision correction that may be the best option for some, especially if they could never get comfortable with the progressive types. But if you want more features and capabilities of visualization such as those mentioned above, and then give the progressive glasses a test, they can provide a much more realistic visual experience, once, get used to.