Posts Tagged ‘progressive lenses’

Progressive Lenses and Their Vitality

March 25th, 2010

It is no denying that the competition in eyeglasses industry is becoming fierce all the more and some products are disqualified during this process. But there is a fact that progressive lenses can always maintain their popularity. Or to some extend, wearers of other lenses also begin to buy them gradually. But some people do not have very clear idea about those lenses. It is a good idea to look at progressive lenses Vs Bifocals. From those comparisons, people may know why progressive lenses can keep their vitality.

  1. A comparison about candidates. All people should make sure whether they are good candidates or not when they buy some glasses or receive eye surgery. Therefore, such matters should also be considered in buying progressive lenses and bifocals. Some people may wonder are progressive lenses good for them or not. Generally, over 95% people are candidates for those lenses. This is because little troubles will be caused by wearing them. As for bifocals, some wearers can not stand the dizziness and headaches caused by radical vision change. And the vision transition in progressive lenses is very natural. In this senses, progressive lenses are suitable for more wearers.
  2. A comparison on adapting time. Adapting process is rather important for wearers of both progressive lenses and bifocals. Generally, progressives can be adapted much easily than bifocals. Then, some may ask why are progressive lenses getting used to so fast? The reason is very simple- wearers of progressive lenses will find that their vision areas are transmitted very natural and no radical change will happen. Or some regular wearers often think no lenses are on their faces. This can never be found in bifocals, for they are lined. Or some regular wearers of bifocals will still suffer from dizziness and headaches occasionally.
  3. A comparison on comfort. In most cases, many wearers will have to endure eye strain to some extend. However, progressive lenses eye strain will never occur onto their wearers. This is because those lenses will firstly provide wearers with great vision clarity, and then stimulate eyes to work in a natural way through which tears will be produced. However, bifocals will make eyes very tired when vision areas are changed. This will lead to strain.

In fact, the merits of progressive lenses lie not in comparison, but in their own quality. And it is a good idea to wear progressive lenses other than lined lenses.

Pros and Cons about Progressive Lenses

March 23rd, 2010

If compared with other lenses, the history of progressive lenses is really too short, no less than half a century. However, it is just the young member that has gained great development and achievements during those several decades. Among all users of those lenses, some think high of them, whereas others do not think so. Therefore, some people who have never used or newly bought those lenses may wonder are progressive lenses good for them or not? In fact, the question is not easy to answer. Here are something related to progressive lenses pros and cons, and people may have a clear idea about those lenses before buying them.

Pros progressive lenses are some of the latest products in the industry, which are upgraded on the basis of bifocals or trifocals. Generally, progressive lenses are good alternatives for some particular eye problems. For example, progressive lenses astigmatism is suitable for sufferers of astigmatism. Moreover, Just because of their unique characteristic- no-line, they are called progressive. That’s to say, compared to conventional lined lenses, no division lines can be found on progressive lenses. Still, wearers will find that the transition among all vision areas is very natural. This has successfully solved some problems in bifocals- radical vision change that may cause dizziness and headache. Still, progressive lenses are perfected in some details. For example, progressive lenses peripheral vision is also very natural with great clarity. Therefore, wearers will never feel any discomfort with them.

Cons In fact, no evident demerits can be found in progressive lenses. But there are still some points should be noticed. Progressive lenses are relatively expensive than other lenses if bought at the same place; the prescription of those lenses is rather time-consuming because all detailed about the eyes would be considered; almost all wearers will spend sometime to get used to them, but lenses from some particular manufacturers will cost less adapting time. For example, progressive lenses Varilux, made buy the world’s top progressive makers, are really perfect and less time will be used to adapt them.

Anyway, progressive lenses are some of the most mature products for sufferers of both near vision and far vision problems. Therefore, consumers should pay more attention on their merits, and try to avoid those demerits.

Progressive lenses with a range of powers

February 1st, 2010

Progressive lenses are corrective lenses used for presbyopia and other eye problems. They are special because of their gradient of increasing lens power. Progressive lenses have several names, such as progressive addition lenses (PAL), progressive power lenses, graduated lenses, no-line bifocals, and varifocal lenses. All of these names can reflect some of the features of progressive lens.

People look down for close reading so that the gradient of progressive lenses starts at the top of the lens, at a minimum power and reaches a maximum addition power at the bottom of the lens. This structure of progressive lenses provides the most comfortable and convenient reading effect. The power gradient length of progressive lens is usually between 15 and 20mm. The power addition gap of progressive lens is between 1.0 to 2.5 which depends on the level of presbyopia of the patient.

Just as the name no-line bifocals suggests, progressive lenses have relationship with bifocal lenses, which have visible lines on the lenses. Progressive lens just eliminates the lines on bifocals and trifocals, so that others will not find that you need reading glasses. This is one advantage of progressive lenses.

Bifocal lenses and trifocal lenses provide two or three lens power on the lens, while progressive lenses provide a seamless progression of many lens power. Progressive lens performs well in more situations, including intermediate zone computer reading. In contrast to several lens power, progressive lenses just provide a more natural correction.

Progressive lens is not perfect. As the lenses combine a range of powers in a single surface, geometric distortions may be caused to visual field, which in turn bring visual discomfort.