Posts Tagged ‘bifocals’

Weigh The Pros And Cons Of Bifocal Eyeglasses

December 6th, 2011

The very mention of bifocal eyeglasses brings to mind many debates and discussions. Opinions and perspectives on the product vary with different groups of people, sometimes to the extent of exact opposition. While some are highly and quite reasonably on their turns in favor of bifocal eyeglasses, others might be totally against it. The extremely polarized views on bifocal eyeglasses give a glimpse of a product combining many merits celebrated by followers and just as many defects scrutinized by its critics. Like two sides of the same coin, the pros and cons of bifocal eyeglasses must be taken into serious consideration when one is deciding whether or not to buy.

In comparison to single vision eyeglasses, the biggest advantage bifocals have is convenience. It saves those who suffer from the double harassment of presbyopia and myopia from the nettling troubles of switching between sets of glasses. By blending two different powers into the same lens, bifocal eyeglasses allow the wearer to see things at distance and things up-close by simply tilting their eyes slightly to look through the respective parts of lenses. Such ingenious design for many people is enough to ignore any drawbacks these glasses may otherwise have, since it spares them from their long-lived headaches once and for all.

For others, however, glasses featuring two powers isn’t enough to cover the many defects, among the most commonly complained of which the notorious image jump is. Because the prescription powers on two sides of the separating line are sharply different, wearers often experienced a sudden jump or distortion of image when their vision moves across the line. Such problem is unavoidable with bifocals or trifocals, what have you, but can be spared with progressive lenses. Featuring a gradient of powers progressing from the top to the bottom of lenses, progressive lenses do give more of a natural view as is advertised. However, that doesn’t mean progressive lenses are the ultimate and perfect alternative to bifocals. Wearers of such lenses often find huge areas of blurred vision at two sides of the lenses, which end up offending many and sending them back to bifocals. It seems that we still need to await the ideal solution that solves all problems and comes with not the slightest drawback. As for the time being, we might as well weigh the pros and cons and our particular conditions and make decisions accordingly.

Modern Bifocal Reading Glasses: Not Your Same Old Heavy Glasses Any More

November 24th, 2011

As a traditional solution to the dilemma of having difficulties seeing things both close up and far off, bifocal reading glasses have come a long way. Once, it was the only way to deal with the nettling troubles triggered by having to constantly switch between different eyeglasses. Now, however, with the emerging and increasing popularity of contacts and optical surgeries, bifocals seem to have lost most of its followers. Many people had long been complaining about the clumsiness and heaviness of their old bifocal reading glasses, so once an alternative is available, they immediately took it, regardless of their lacking of real advantages. It is only after they are over the novelty of the new stuff and begin to find them with as many, if not more, problems as bifocal reading glasses, did they look back and take one more chance on their old problems. And this time around, bifocal reading glasses, with the new varieties and variants provided by the rapidly developing optical techniques and technology, sure won’t let them down.

As is widely recognized, bifocal lenses were invented by Benjamin Franklin, one of the founding fathers of the United States. Besides drafted and issued the constitutions for one of the strongest countries now in the world, Benjamin was also a frequent inventor. At the time, he was experiencing what is familiar to thousands upon thousands today, a combination of myopia and presbyopia. The custom approach to solve such problem at the time was to carry multiple pairs of eyeglasses for varying vision ranges and put on a certain pair when the corresponding vision correction is needed. A great man like Mr. Franklin was never going to make peace with the unsatisfying current solution. He studies the science behind eyeglasses and ingeniously, with immense imagination and creativity, blended two pieces of lenses of different powers into the same lens, and the rest goes the history.

bifocal 2

Bifocal lenses were thus invented, yet in retrospect, the ones made in Franklin’s age did seem a little bit clumsy. Because the lenses consists of two different parts, they were usually larger than single vision ones. Besides, in an age when most lenses were made of glass, the weight of such specs can only be added. The visible line separating different powers was a major issue as well. Many people don’t like the idea of having their age written right on their faces. All the above-mentioned drawbacks have been causing bifocal reading glasses to wade through their dark days and then later solved one by one alongside the unprecedented developments and achievements with materials, techniques. For instance, the use of lightweight material such as Trivex, polycarbonate and CR-39 have not only made bifocal reading glasses lighter than ever but also given them a chance to be more versatile in styles, since lighter lenses are compatible to a large number of frames. You could even have your bifocal readers semi-rimmed to have that classy and business-minded look you’ve been long craving for. For those who have been sick and tired of the telltale lines on bifocal glasses, progressive lenses may be of their interest. By blending practically innumerable powers into the same lens, progressives, also known as no-line bifocals, provide the same convenience as bifocals while having the visible lines rid off at the same time.

All and all, those of you who still dwell on the old impressions of bifocal reading glasses need to come out and give them a new chance. Some of you may still not like them but who knows, maybe some other will stick to them for the rest of their lives.

Bifocal Glasses: An All-Rounder That Is Hard to Come By

November 23rd, 2011

In full swing is the heated debate of bifocal glasses being the ultimate savior of people’s eyesight. True enough, we opt for bifocal glasses instead of other alternatives on account of three reasons. An overall series of comparison and contrast conducted in such respect will bring home to you the merits of bifocal glasses.

Bifocal glasses Vs. Single vision glasses
With the passage of time, men at middle age are liable to subject to the combined harassment of myopia and presbyopia. The singly-functioned eyeglasses with either single distance vision prescription or near vision prescription can no longer satisfy your increasing focusing needs for all kinds of distance view. Owing to such a fatal defect, single vision glasses are destined to fail to carry out people’s wish to accommodate their eyes to various viewing distance with conspicuous clarity. Nevertheless, bifocal glasses, instead, are equipped with two distinct optical powers in one single lens, that is, the distant vision prescription on the upper portion of the lens and the near vision prescription on the lower part. With such two different prescriptions in one lens, those who suffer from myopia and presbyopia at the same time will be able to see things in the far distance clearly through the upper part, and read small printed materials or books with perfect ease and clarity.

Bifocal glasses Vs. Progressive eyeglasses
Progressive glasses, other named multifocal eyeglasses, are eyeglasses that have a gradient of optical powers embedded in the lenses which enables their wearers to see things clearly in different viewing distance. Versatile as progressive eyeglasses may be, they at times offer more than we wanted. If your eyesight is not as bad as what progressive glasses demand, odds are that you might have you vision health impaired by wearing such glasses. Moreover, the merit of smooth image transition brandished by progressive glasses has now been successfully applied to the lenses of bifocal glasses. With bifocal glasses on our faces, we are spared the ordeal of image jump. Besides, a pair of bifocal eyeglasses is on the whole much cheaper than progressive ones. That’s the fetching news to some tight-budgeted consumers.

It is no exaggeration to claim that bifocal glasses will conducive to your vision health to the utmost, if only you obtain the right one that will suit you most. You, on the receiving end, will absolutely grow fond of them once you have benefited from them.

What Can Bifocals Bring For You?

April 8th, 2010

It is no denying that bifocals are very popular among people of certain groups. Since the day when they come into being, bifocals have undertaken special mission- to rescue people with both near vision and far vision problems. The first bifocals, invented by Benjamin Franklin, are used to correct presbyopia and nearsightedness. However, with the developments of technology, they can be used to cure more problems. For example, there are also bifocal lenses for astigmatism in the market.

In fact, bifocal lenses can be used for people of any age group. And people of particular age group can benefit a lot by wearing them. For instance, children bifocal lenses are very ideal alternatives for kids. Some specialists strong suggest children with myopia to wear those lenses. This is because bifocals can slow down the degeneration of myopia. And facts have proved this point. Therefore, bifocal lenses are much better choices for kids than ordinary lenses that may worsen the eye problems.

Of course, the early bifocals are used to rectify vision problems. However, as people pay more attention to fashion and what they wear, bifocals lenses become accessories to some extent. Especially, when it comes to summer, bifocal sunglasses become very popular among wearers of all walks of life. Those sunglasses can sometimes highlight people’s personal tastes and elegance. Here are some typical cases of those sunglasses. Bifocal sunglasses for women are very beloved choices among females, for these glasses can make them much more attractive to look at. For example, frames with green, red, etc. are very popular among young girls. Moreover, the greatest element in bifocal sunglasses for men is coolness. Some of them make the wearers serious to look at, while others cool and vigorous. Certainly, there are also unisex bifocal sunglasses that are suitable for both male and female.

As for people who love to do some particular activities or sports, there are also bifocals for sports use. For instance, if one loves to fish outdoors, he may choose bifocal fishing sunglasses. Those sunglasses can help protect wearers’ eyes by filtering out glares and other harmful rays. Still, wearers are very cool to see.

There are still many bifocals of other types, and people are suggested to search more if need.

Merits and Demerits of Bifocals and trifocals

April 7th, 2010

Bifocals and trifocals are two of the most important varifocal lenses in people’s daily lives. Each of them has their own advantages and disadvantages. Here is some wanted information about the two lenses for many people, especially those new wearers.

Bifocals have two different vision areas, each of which is responsible for near vision and far vision respectively. But many people may hear from others that bifocal lenses problems are really very troublesome. This is partly true. All those problems are mainly caused by their unique structures. Those lenses are combined by two different cut lenses. That’s to say, each of them is responsible for vision at different distance. And many wearers may suffer from very serious dizziness and headaches occasionally when they change their vision radically. The reason is the optic nerves in wearers’ mind can not react in time with the vision change, and the brain will suffer greatly as a result. Another very common symptom is almost all people will spend some time to adapt them, though the time varies a lot.

In order to solve those problems caused by bifocals, lots of designers and professionals have spared no efforts to improve them. Later, the birth of varifocal bifocal lenses has satisfied wearers’ demands to some extent. Those lenses can ensure wearers enjoy great vision clarity and comfort without any aforesaid complications.

Trifocals are more advanced lenses than bifocals in some senses. There are three different vision areas in those lenses, namely, areas for far vision, intermediate vision and nearby vision. This design can help wearers more easily get used to them and reduce the chances of radical vision transition. Therefore, the cost of trifocal lenses is much greater than some bifocals and other conventional lenses. But there are some exceptions if wearers buy them from different retailers. For example, products from online vendors are much cheaper than optical stores. Still, people can also ask for help from certain Insurance Companies who provide such services sometimes.

In a word, those bifocal trifocal lenses can effectively help solve some particular eye problems, though people may withstand some discomfort while wearing. There is a trend that more and more innovations are made on them and more comfort can be found on them as well.

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.

What are bifocals and bifocal contacts?

December 5th, 2009

Though bifocals are not the earliest members in the glasses family, they have made great success since the day they are invented. It is said that the great Benjamin Franklin has created the first bifocals. Despite there are no evidences that can exactly tell who is the inventors; the world has unanimously agreed that Franklin is the inventor of bifocals.

The earliest function of bifocals is for vision correction. Some people in then time accidentally found that bifocals can improve their eyesight. The earliest bifocals are comprised of two pieces of convex glasses, and they can help people look objects much clearer.

The first bifocals are very different from that of nowadays. With time goes by, bifocals have got their modern forms since the beginning of 20th century. Nowadays people can notice that the different forms of bifocals are available in modern society.

Among various forms of bifocals, bifocal contacts are very special and popular. Regular wearers have come into recognition that bifocal contacts are not limited to improve their vision. Generally speaking, bifocal contacts can always make their wearers comfortable. When wearing a pair of bifocal contacts, people feel that their eyes are in ease all the time. With the usage of high technologies in bifocals, bifocal contacts are easily to take off or wear. And almost all bifocal contacts are UV-resistible.

As for many wearers, bifocal contacts are essential for their lives. Some people, especially these old people, are very satisfied with bifocal contacts, for in their past several decades, these vision correction aids have made their life colorful.

Addition to bifocal contacts, there are still many other forms of bifocals at the market. However changeable are their forms, bifocals will serve for the people all long.

Differences between Trifocals and Bifocals

November 21st, 2009

Trifocals are a new group of special reading glasses which have three divisions on the lenses for correcting vision. It is different from traditional bifocals which have only two such divisions. The lower sections of the lens of trifocals are demarcated by a thin line which is a semi circular arc. One area is for near and the other for intermediate vision correction. And the part for intermediate rectification lies above the nearsighted correction area which is near the bottom of the lens. For those who used to wear bifocals may think it is strange to reading with glasses having three lines etched on it. As trifocals are new to most of people, it actually did need time for patient who uses this type of glasses to adjust to them. However, once you used to wear them, you will find it pretty easy to use and it is more convenient than bifocals.

After eye exam by the eye doctor, those people with extreme presbyopia, which means their net optical power with a special unit of diopter is very high, will be recommended to use trifocals. Because, unlike bifocals, trifocals can correct all ranges of vision, from nearby, intermediary to far distance, when bifocals can correct only two of them, either near vision or distance vision. Since trifocals can offer three levels of correction, it can give you a better vision. So, if you are one of the extreme presbyopia, you will get the better and more clarified vision when you use trifocals.

Trifocals are not only for those who have extreme presbyopia, it can also correct intermediate distance which can’t be provided by bifocals. For example, if your have a vision of -4 diopters, usually you will be recommended to use a glasses with a correction of 3 units, which means you vision is -1 diopter when you wear your reading glasses. The intermediate correction for such situation may be end up with a power of -2.5, which may take patients a little time to get used to it.

So with a single pair of trifocals, you can solve all problems that are related to presbyopia.

The conveniences of bifocal contact lens

October 8th, 2009

Bifocal contact lens is a relatively new member in the family of bifocals. For their special designs and features, bifocal contact lens did not come into being until 1930s. But the first bifocal contact lenses are not ideal alternates for many people. And many people did not bear very good passion for these newly designed bifocal contact lenses. This is because of the backwardness of technologies and this has caused a lot uncomfortable to wearers. However, with the development of technologies in bifocals, great achievements have been made in bifocal contact lens. Especially, since the year 1982, new technologies have solved all the problems in bifocal contact lenses. Hence bifocal contact lenses have become very popular among the masses. Now many people make bifocal contact lenses as their first choice.

Bifocal contact lens allows wearers to see objects both far and near. Because the bifocal contact lens are the results of very complex designs. Wearers of bifocal contact lenses can move their eyes freely, either upward or downward. Wherever the eyes moves, some adjustments can be automatically made in bifocal contact lenses.

Generally speaking, the materials of bifocal contact lenses can be divided into to categories: rigid gas permeable and soft toric lenses. Principally, there are no differences between the two categories. And consumers can also find disposal bifocal contact lens at the market. This bifocal contact lens can be replaced at intervals.

Some wearers of bifocal contact lens worry whether the prescription can be adjusted with the change of vision. In fact it is no need to worry that. For bifocal contact lens can be adjusted at any time with the change of the need of the wearers.