Posts Tagged ‘varifocal glasses’

about Varifocal glasses

June 28th, 2015

Varifocal glasses also called progressive eyeglasses, which are used to correct presbyopia and other disorders of accommodation. Varifocal glasses are lenses with no visible line that are used to correct distance vision, at arm’s length and close-up viewing. To make sure your lenses work as well as possible, you need a frame that will optimize the way they work. This means making sure the lens height no less than 28mm to fit in the different prescription.

Moreover, because varifocal glasses have different prescriptions in different places, you will need to use them differently depending on what you are doing. The top part of the lens has your distance prescription and you will use this for looking at things that are further away, when doing things like watching television, going to theatre or admiring a view, for example. The progressive corridor or the place where the lens changes between your distance and reading prescriptions, is in the middle of your glasses. You will use this part of the lens for viewing things at mid-range, such as when using the computer or cooking. The lower part of the lens is where the reading prescription will be, and you will use this to do any close work, things like reading, sewing, or anything intricate like painting.

They have three invisible zones that allow easy viewing transition between zones – allowing sharp vision from near to far in one lens. Progressive lenses are designed using state-of-the-art optical technology, and when adjusted to the individual’s specific needs, they provide great wearer satisfaction. Sometimes, however, a little training is necessary for people to get used to wearing progressive lenses. The eye and the brain have to learn to adjust to the different refractive powers of the lenses. Here is an example: When someone wearing progressive lenses climbs stairs, they will look through the lower portion of their lenses. In progressive lenses, this is the area that is adjusted for a reading distance of approximately 40 centimeters. The stairs are, of course, depending on their size, clearly further away. Thus the stairs will be viewed with distortion. The good news: The sense of sight is highly complex – and it is also a very adaptable system. Within a short period of time, it is able to learn and to adapt to new viewing conditions; so when climbing the stairs, a wearer simply points his head somewhat further downwards.

Single-vision glasses and varifocal glasses

June 24th, 2010

Eyeglasses have prescription and non-prescription types, according to the lens power. Non-prescription eyeglasses utilize Plano lenses and are simply for eye beauty enhancement. However, there are a couple of different members in the prescription eyewear family. Nowadays, a large group of people living in this world have poor eyesight caused by various eye problems. Some are even blind. Vision is one of the most precious gifts granted by the god to human beings. Individuals who have unsatisfactory vision would always try hard to get their eyes treated. Until now, visual refractive errors are certainly the most common reasons for poor eyesight, and they bother a large portion of the world’s population. Another fact is that prescription eyeglasses in various forms are the major solution to refractive errors. Another common eye condition called presbyopia is also within the control of Rx eyewear. Aimed to deal with all these different eye conditions, prescription eyeglasses have different types. Single-vision glasses and varifocal glasses are two basic forms, a classification based on the number of lens focal points.

Single-vision glasses are actually a wide concept, which covers different forms of eyewear products. Indicated by the name, these prescription eyeglasses have Rx lenses that can deal with a single vision problem: myopia, hyperopia or presbyopia. This functionality is completely determined by the lens power. All people know that lens power determines the degree and the form of vision correction. A further explanation is that a lens used in single-vision glasses has only one focal point. This states clearly why their capability is restricted. But for patients who have only one of the vision problems listed above, single-vision glasses are certainly enough. For those beyond this group, varifocal glasses are the right option.

The fundamental difference between a single-vision pair and a varifocal pair is the focal points within a single lens. Different from a single-vision lens, a varifocal lens has more than one focal point. And according to detailed focal points, there are several types of varifocal eyewear. In detail, bifocal glasses have two focal points, trifocal glasses are made with three focal points and progressive reading glasses has a set of progressive addition focal points or powers. With the help of these forms of powerful lenses, varifocal glasses can deal with more than one vision problem within a single pair.

Introduction of Several Bifocals

March 31st, 2010

As one of the oldest forms of varifocal glasses, bifocals can still maintain their vitality all the more. Then, some people may ask- what are varifocal glasses? Varifocal glasses refer to those glasses that have more than one focuses in one lens- some have two, others have three or more. Bifocals are just such typical glasses with two focuses. Some people may think that bifocals should retreat from their markets, for there are some much advanced glasses- trifocals and progressive glasses. In fact, it is not the case because more and more innovations are now made on them.

Bifocal safety glasses are just one of the most important forms of bifocals. Those glasses are bettered on the basis of conventional bifocals and can assure wearers enjoy great security with them. In particular, if people often expose their eyes to the sun light, their eyes may become injured as a result. Correspondingly, those safety glasses can make sure that wearers can enjoy ideal vision clarity without worrying about any potential damages. Those glasses are now available by almost all famous glasses manufacturers. For example, Lowes, one of the world’s top glasses makers, manufactures and provides the first-class bifocal safety glasses to consumers of all walks of life. Therefore, people may have a try on their products- bifocal safety glasses Lowes.

There are still bifocal glasses for sports use. Those glasses are specially designed for sportsmen and fans. Generally, wearers will have endured the pain caused by glares and other unwanted lights. With those glasses, some wanted lights will be highlighted and other unwanted lights will be filtered. In a word, sportsmen can have much better performance with them. And it can be easily to explain the reason why so many people love to wear bifocal sport glasses.

In addition, there are also bifocal sunglasses of different forms and types. Of which, bifocal reading sunglasses polarized are very outstanding. They are some of the best alternatives for people who love to read under sun lights or around any places with great glares. They can block any harmful radiations and rays in the sun lights and can also filter out any glares reflected by glass or water. So, some people who love to fish also wear such sunglasses.

Of course, there are also many other unique bifocals, like progressive bifocals, etc. And this can help explain why those glasses are still very popular among people.