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Bifocal And Trifocal Eyeglasses Come To Many Senior Citizens’ Rescue Timely And Effectively

October 25th, 2011

Bifocal and trifocal eyeglasses are no strange items to any one who’s passed the dividing age of 40 and who’s started to feel difficulties seeing things of different distances. However, not everyone who’s passed that age threshold is required to wear such eyeglasses if they want to have freely changeable visions for their daily uses. See, the age factor in this matter merely indicate the possibility of a case of presbyopia, brought about by the fossilization of crystalline lenses in our eyes alongside aging processes in all other organs. The typical symptom of such case is a difficulty to focus at close ranges which can be easily tackled by a pair of carefully selected magnifying specs. No multiple prescription power eyeglasses are needed in that matter. What makes the whole thing tricky is the likeliness that some might have other vision problems before they turn 40 and fulfill their doomed destiny. For instance, one who already is myopic before they pick up their old vision might find the single powered magnifying glasses unsatisfactory. At such times, bifocal or trifocal eyeglasses come in their rescue.


Unlike regular single vision eyeglasses, bifocal glasses and trifocal glasses feature more than one prescription powers on the very same pair. Such design might’ve be laughed as pure heresy in the old ages when the golden touch of modern science hasn’t transformed people’s life dramatically as it did later on. But, with today’s technology, to make such eyeglasses is but the simplest practice. Modern technicians blend two or three pieces of lenses with different powers together and fit them into the same frames and hence come a revolutionizing product. Sure the telltale lines in the middle can and are being interpreted by some as nerdy and out of style, but for those who value more on the practical function than the fancy but useless fashion aspect, such lines can be also be representing mature and trust-worthy.

bifocal and trifocal eyeglasses

Some might cite progressive eyeglasses, a more technology-laden product than bifocals and trifocals, as a better alternative. On the surface, it may appear so, since with the all changing prescription powers on these specs, one is able to see things at different distances and get rid of the telltale sign of age at the same time. But, under a closer look, the statement may not necessarily always be true. Due to the unique design of progressive lenses, wearers are often required to turn or tilt his whole head at certain direction just to see certain object, otherwise, the wearer is liable to experience vision distortion. This normally requires a period of adjusting to get used to, which varies from a couple of days to several weeks. Most people may end up comfortable with those specs, but there are some who just never can get pass the adjustment. For them, wearing progressives is not only a nightmare but sometimes a danger. Switching back to bifocals and trifocals is a wise and rationalized decision they can make, and a decision also will benefit them more than they expected. As long as they look pass the unsightly aspect of it, they will turn out enjoying these glasses better than their old pair of progressives.

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How Does No Line Bifocal Work

October 5th, 2011

No line bifocals, also known as progressive lenses, are multifocal lenses with no visible lines. They help you see things clearly at near, intermediate and long distances without losing quality of the vision, such as “image jump” and distortion in the cases of conventional bifocals and trifocals, and the telltale signs that immediately give away your age. Thanks to their many merits, no line bifocals are purchased and adored by many, but rarely do people look behind the surface and ask the question: how exactly does no line bifocal work. Well, today, we find out.

You see, for our eyes to accommodate from a up close vision power to a distant one, we need to make use of a special part of our eyes called crystalline lenses. To bring light from different distance into focus, the elastic crystalline lenses have to constantly change their curvature. When we were young, our crystalline lenses would have no problem in doing so. However, as we grow older, they gradually lose their elasticity and finally as we enter our 40s, we find ourselves victims to the ubiquitous presbyopia. Many people seek help from magnifying glasses. However, for those who already have a history with myopia and prescription glasses, things are different. What they are facing is far from the normal single refractive error, but rather a complicated mixture of multi refractive errors. They not only need correction for presbyopia so as to see things at a distance but also need correction for nearsightedness to see things up close. And this is where no line bifocals come in. In order to achieve multi prescription powers in the same lenses, the latest techniques in the optical industry are used to make the curvatures of every different vertical point different. This way, a smooth and gradual progression of powers from the upper parts of lenses to the bottoms is made. Light coming from different distances are bent with the help of corresponding prescription powers and thereafter brought to focus.

After a clear and detailed explain of how progressive glasses work, we are sure you are better equipped with the necessary knowledge to make your own decision as to whether or not progressive glasses are your thing. Weigh the pros and cons, and we are certain you will choose wisely for the sake of your eyes.

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Metal Frame Bifocal Eyewear: The Best Choice For Those With Multiple Vision Errors

September 2nd, 2011

As we know, most people who need corrective eyewear don’t just suffer from presbyopia. Many of them also have myopia, hyperopia and/or astigmatism. For them, a pair of single prescription glasses is far from enough. They need bifocal glasses so that they can accommodate easily from a distance vision to a close-up one. Having two distinct optical powers on each pair, bifocal glasses are specially used for corrections of presbyopia and other refractive errors. With this type of glasses, one can easily see things of distance by looking through the upper part of the lenses and read fine prints at a close-up range by moving down the vision field and looking through the lower part. Both bifocal glasses and shades come in a variety of frame types, including metal, plastic, horn and even wood. Out of all these materials, metal makes the best frame choice for bifocal eyewear, being it glasses or shades. With its incredible strength, impact resistance and unmatchable fashion value, metal framed bifocal eyewear certainly provide the best eyecare both optically and physically for those of us who suffer from more than one vision error.

Metal Frame Bifocal Eyewear

In the case of bifocal glasses, every lens contains two distinct optical powers, hence two different segments of lenses separated by a line. This feature make it inevitable for the lenses to be super large and for these large lenses to be kept in place, the frame material must be of incredible strength. Metal, as it happens, is the strongest material used in the optical industry, which makes it the best frame choice for bifocal glasses. Besides being able to hold the large bifocal lenses perfectly, metal frames can also be made extremely lightweight. With the rapid development of frame techniques and the use of certain types of metal such as stainless steel and titanium, bifocal glasses with metal frames can be made even lighter than those framed with plastic, making them the better choice between the two. Aside from being strong and lightweight, certain types of metal are also extremely flexible. With their incredible resilience, these material can be made into bendable even memory frames that can automatically return back into shape after they have been deformed. Strong, lightweight and flexible, metal framed bifocal glasses surely will be the most durable eyewear you ever make an investment in.

Metal Frame Bifocal Eyewear 1

Aside from being able to last a long time and therefore save the wearer a fortune, metal framed bifocal glasses also come in a huge fusion of styles. From the classic Ray Ban aviator to the much loved Wayfarer and Carrera, metal frames are ubiquitous, and since these metal framed glasses always give out that bold and masculine vibe the current fashion world is so desperately craving, it’s no surprise at all that they will keep on rocking the world for at least a couple of seasons to come.

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A Panorama of Bifocal Eyeglasses

April 12th, 2010

Among all the great inventions in the history of human being, eyeglasses are included. According to some data, the first modern-alike eyeglasses did not come into being until the 13th century in Italy. Since then, eyeglasses started their course of enhancing vision. However, people gradually found that some eye problems could not be solved by ordinary glasses, for they might have more than one eye diseases simultaneously. But the practicable solution for such problem did not become possible till the emergence of bifocal eyeglasses.

Bifocal eyeglasses, as their names indicate, are eyeglasses that have two focuses. For each lenses, there are two parts, say, the top part and the lower part. The former part is for distance vision and the later one is for nearby vision. Therefore, one can look at the top part if he wants to look afar; and look at the lower part if reads. Generally, the former one is much wider than the later one. This is because much wider vision area is needed when one looks afar. Therefore, there is an invisible vision arch in the lenses. Due to their unique merits, bifocal eyeglasses can effectively solve eye problems like, presbyopia, astigmatism, myopia, etc. that may occur at the same.

However, the invention of bifocal eyeglasses is rather complicated and they do not appear till the late18th century. Here is some information about the history.

In fact, the history of bifocal eyeglasses is a legend. Although who have invented bifocal eyeglasses is still in controversy, most people deem Benjamin Franklin as the only legal inventor. According to bifocal glasses Wiki, Benjamin Franklin had some problems in reading when he was old. However, he was such a creative man that he decided to solve them by making some glasses. One day, he found his problems can be treated by overlapping two lenses, namely, one is for near vision, and another is for far vision. Then, he began to embed the two lenses in one frame. And the ultimate result was-with those newly created glasses he could see clearly of objects afar after reading for sometime. It might be possible that Franklin is not the first inventor of bifocals, but he should be the first to wear them.

The bifocal eyeglasses created by Franklin are not as nice as people can now use. They are roughly made, partly due to then backward technology. However, as some innovations are made in the industry, bifocals are also perfected all the more. Only two century are passed away, bifocals in nowadays are really very practical and nice in solving the aforesaid eye problems. For example, people will seldom complain of their eye problems with personalized bifocal eyeglasses. Or to some extent, those glasses can highlight their personal tastes and elegance.

Professionals in the industry find there are still many things to do with bifocal eyeglasses. In addition to assimilating some fashionable elements in their designs and products, they also spare no efforts in strengthening their functions of vision correction. For example, most of the bifocals are lined glasses, and they have prompted some no-lined bifocals recently. Those newly upgraded lenses have bettered people’s lives greatly.

It is no denying that with the development of technology, more achievements will be scored in bifocals. Here is a promising and bright future.

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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.

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How Do Eyeglasses Come into Being?

March 14th, 2010

Eyeglass, frames bearing lenses worn in front of the eyes, normally for vision correction, eye protection, or for protection from UV rays, is really a great invention that has radically changed human life. It helps people do the simplest the things in daily life and most difficult thing in scientific researches. Just imagine a world without eyeglasses, we would walk around bumping into things and driving our cars up onto the sidewalk. Everybody would the importance of eyeglasses.

However, as for the history of eyeglasses, we know little about it. We merely know eyeglasses were invented during the period of 1265 and 1290, however, few knows who the person first invented eyeglasses is and how eyeglasses come into being.

Here below is a brief introduction about the history of eyeglasses:

The initial glasses were not as glasses today. They were composed merely of lenses without legs to make glasses steady hung in front of eyes, but just perch on the nose. This structure posed great inconvenience and difficulty to the wear, especially when they moved, the glasses tended to fall over.

During the 1720’s, the emergence of eyeglass frames solved the inconvenience. This frame is that we know today with arms that the wearer used as the primary means of support. With the frames, eyeglasses are able to stay more comfortably and stably on noses.

The original material of frame that made up the first eyeglasses was metal or bone, while the original material of lenses that made up the fist eyeglasses was quartz. At that time, the producers were not able to produce flawless lenses.

Since the inception of the first eyeglasses, efforts had been made both in comfort and function. Researchers committed to bring the best eyewear for people.

At the very beginning, eyeglasses could only function to correct near sightedness and farsightedness by simple magnification. But in the mid 1780’s, eyeglasses of the bi-focal came into being with the efforts of inventor and visionary Benjamin Franklin.

There is an interesting story concerning how Benjamin came to invent eyeglasses of bi-focal. It is said that he felt bothered to constantly choose eyeglasses for near vision and far vision to complete different tasks. In order to eliminate this trouble, Benjamin invented a set of lenses that would work to correct both vision problems that he suffered from.

The fact is that, with years’ development in eyeglass industry, there are not only eyeglasses for bi-focals, but also progressive lenses for different correction properties as your proceed from the top of the lens down to the bottom. If Benjamin would see this, he will must be feel unbelievable.

As lens develops, frame never falls back. Today, in market, you can see frames of different colors and different styles to meet different needs of different people. The biggest advancement is that today’s frames are light enough, and the wear feel little burden on their noses. What is more, some frames today are able to be bent and twisted, which prolongs the usage time of eyeglasses.

We dare say that the invention of hard or soft contact lenses and the creation of vision correction surgery contribute to the invention of eyeglasses. Without eyeglasses, the world becomes colorless and blur.

Although we can not make sure it is who firstly invented eyeglasses, we know that he or she did a real great contribution to the human life and human existence. Besides, a lot of other people who had a hand in the development and evolution of eyeglasses should also be respected.

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Types of prescription glasses

February 17th, 2010

Most of the corrective eyeglasses should be checked and prescribed by eye doctors, which are called prescription glasses. There are 4 types of prescription glasses which are designed and made to correct vision based on different circumstances.

The mostly used prescription glasses are for single vision. Most of eyeglasses wearers fit in this category. Single myopia, hyperopia and astigmatism only needs single correction. This group of prescription glasses is the easiest portion with the least return and complaints.

The second type is called double focal of bifocal prescription glasses. Bifocals were invented by Benjamin Franklin. He fused the farsighted lenses with the nearsighted one, thus he freed himself from interchanging two prescription glasses frequently. This type of prescription glasses are used by patients of presbyopia who are generally over 40s and are synchronously near- and far-sighted. Bifocal prescription glasses have two pairs of optical centers, which are equal to two pairs of eyeglasses.

Trifocal prescription glasses mean there are three pairs of optical centers. Its basic function is similar to bifocal prescription glasses except that trifocal possesses the center focal point which is for intermediate vision for a smoother transit from near to far.

The fourth is called progressive prescription glasses. This is also called no-line bifocals, for use by presbyopia patients to have a better look, as bifocal prescription glasses give other people a sign of being “old”!

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Presbyopic people benefit from new contact lens—-bifocal lens

December 3rd, 2009

In the family of corrective contacts, bifocal lens is totally different. This is because bifocal lens has some characteristics that others do not have. Since the day when bifocal eyeglasses were invented by Benjamin Franklin, they have helped a lot of people. And now they have become much perfect though the mechanism is still the same.

People who have been diagnosed as presbyopia are in need of bifocal lens. For the uniqueness of presbyopia, there are still many problems in solving them. The patients either can see the objects near and far simultaneously, or can they move their eyes freely. As for these symptoms, people have designed bifocal lenses to tackle with them.

By and large, people can find two kinds of these lenses at the market, namely, alternating bifocal lenses and simultaneous bifocal lenses. When people look upward or downward, alternating bifocal lenses can help a lot, because pupils can notice the two power distance between distance and near powers. As their names indicate, simultaneous bifocal lenses can make sure that the two powers can be looked at the same time.

Though bifocal lenses are mainly for people suffering presbyopia, not all of the presbyopia suffers can wear these contact lenses. Each bifocal lens should fit the conditions of individual patients. Some repulsive effects may happen to people who can not wear bifocal lens. Some criteria must be met if presbyopic patients need to be prescribed bifocal lenses. They should have very good tear system, healthy cornea, and normal blink rates. If they fail to meet these requirements, bifocal lenses are not suitable for them.

Additionally, some items need to be noticed when storing and cleaning bifocal lens. In order not to be infected, hands should be clearly washed before handling these lenses. Moreover, bifocal lens should be cleaned regularly using proper solutions.

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Innovative bifocal glasses

December 2nd, 2009

Bifocal glasses are not a recent invention. As the story says, Benjamin Franklin had two sets of glasses, one for faraway objects and the other for close reading. He reluctantly shifted from the two separate glasses, which is very inconvenient. After quite a period of this bother, the great forerunner designed a pair of bifocal glasses that allow him to see both distant and near things clearly. This was the initial form of bifocal reading glasses. He just cut the two pairs of glasses in half and used half of each lens for each eye so that the bifocal glasses were invented.

Science and technology always advance at a rapid pace, but the basic principle of bifocal reading glasses has remained the same since its invention. The lens of modern bifocal glasses has two parts: the lower part for close reading and the upper for distant vision. This design principle of bifocal reading glasses is based on the common sense that people generally use bifocal glasses in certain ways. They look downwards the bifocal reading glasses when reading or looking at close objects and look up when looking at distant things.

Bifocal glasses are truly useful for a large population that develops prysbiopia on earth. In the US alone, almost 4 million people suffer from it each year, most of which are between thirty to fifty years of age. Bifocal glasses have become a necessary part of their lives. Bifocal reading glasses eliminate the switch between separate glasses.

Bifocal glasses also perform as the pioneer of multifocals, followed by trifocals and progressive glasses. After the invention of bifocal reading glasses, multifocal glasses are natural.

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