Multifocal lenses are lenses with “multiple centers of focus”. People may suffer from more than one vision error or several vision problems in different situations. Without the invention of multifocal lens, eye wearers must keep several separate pairs of glasses for different vision purposes. For example, a first one is for myopia, a second one for hyperopia, and even a third one for computer working. Now, multifocal lenses can solve all these vision problems within a single pair. How amazing it is!

Multifocal lens is just a general concept. There are actually there types of multifocal lenses: bifocal lenses, trifocal lenses and progressive lenses.

Bifocal lenses are the most popular form of multifocal lenses. You can consider a bifocal lens just as a multifocal lens with only “two points of focus”. They allow people to see things in the distance as well as close up. This type of multifocal lens is suitable for people with both myopia and presbyopia. One of the most famous people was Franklin, who was also the father of initial bifocal lenses. Statistics show that more than half of the people who wear eyeglasses wear these “two points” multifocal lenses.

Another form of multifocal lenses is trifocal lenses. In similar, trifocal lenses have “three points of focus”. This type of multifocal lens features three vision correction functions. They have medium viewing capability, in addition to distance viewing and close reading possessed by bifocal lenses.

The third form of multifocal lenses is progressive lenses. This type of multifocal lens has so many focal points that it leads to a more true vision correction solution. Progressive lenses also remove the visible line on bifocals and trifocals, making the lenses more natural and achieving aesthetic performance. Of course these multifocal lenses are more complex in design so that they are more expensive.

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It is a real challenge for glasses manufactures to make lenses for sufferers of presbyopia, for such lenses are too complicated. Fortunately, there are some new contacts that can be used for theses sufferers. These lenses are called bifocal contacts. In fact, these lenses are multi-functional. They can also be used to cure common eye problems, as myopia and farsightedness, etc.

One of the greatest characteristics that can be found in these lenses is these lenses can work automatically. That means the lenses will adjust themselves to the conditions of people’s eyes while they doing something. For example, if people read something, these lenses will adjust themselves to the angle through which the retina can get correct right light. True is the distant objects. So these lenses can work no worse than those thick glasses.

The mechanism underlying the contacts is very special. There are also different parts in the lenses for corresponding problems. However, the maintenance of bifocal contact lenses is very important. So people should use some specific solutions and other caring systems for the lenses.

Sufferers of some complex eye problems, as astigmatism and presbyopia, are no longer in need of doing some brothering things as they used to be. Bifocal contact lenses can help them solve all these problems perfectly. There is still an important point people should remember that these lenses should be kept in the particular solution if they do not wear them, for the solution can get rid of any wastes on the lenses, which can lead to infection.

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Firmoo.com is the fastest growing online community selling affordable yet high quality prescription eyeglasses, prescription sunglasses and other eyewear. Firmoo’s return and refund policy makes your purchase with Firmoo risk-free. Firmoo offers single vision, full-frame, semirimless and rimless bifocal reading glasses (the upper part above the middle line is for seeing far) as well as progressive glasses to fashion- and budget-conscious customers.

As the name reflects, a pair of bifocal safety eyewear can serve as either bifocal reading glasses or safety eyeglasses. The reason is that this special kind of spectacles combines the functionalities of traditional bifocals and protective eyewear together. A single pair of bifocal safety glasses can provide a user with both visual need while reading and eye protection against dangerous sources in the environment. In fact, safety goggles or protective eyeglasses are needed by a large number of jobs and hobbies. And people who are operating most power tools are highly encouraged to wear protective goggles. However, traditional goggles or protective eyeglasses are refused by some people who still need visual aids. Regular prescription goggles are then introduced to flatter a special group of people who regularly manage power tools and suffer nearsightedness or farsightedness.

Nevertheless, for people who have presbyopia and have occupations associated with certain power tools, regular prescription goggles are not enough. The reason is that the vision correction provided by regular prescription goggles will not help in viewing close up objects. Near vision for presbyopic people is to some extent very important when they try to deal with precise operation on some objects. In this case, bifocal safety eyewear is a perfect solution. This type of eyewear can meet the needs of the mentioned group of people and the others in a similar situation. The bifocal effect of visual aid marks the difference between a pair of bifocal safety glasses and another pair of regular prescription spectacles.

The lens design of bifocal safety eyewear may be slightly different from most of the bifocal reading glasses. Lenses of the former type usually come with only a reading power in the bottom part, while the upper section is Plano or non-prescription. Most people know that a regular bifocal lens deals with both presbyopia and nearsightedness or hyperopia. But this is not the case of the majority of bifocal safety eyeglasses.

C: bifocal safety eyewear has the basic design that the upper part of a lens has normal magnification and the lower portion can facilitate reading and similar tasks.

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Bifocal reading glasses were initially developed to offset a common problem among presbyopic individuals. There is now a considerable portion of folks in their 40s and 50s who start to suffer presbyopia. This visual condition will cause a difficulty in seeing close up objects. There is a common phrase that describes vividly the symptom caused by this eye problem: “too short arms”. This is because presbyopic patients are used to hold the reading materials at an arm’s length, in which position can they get a clear view. The need for bifocal eyeglasses is still driven by another visual problem, either nearsightedness or farsightedness. Some presbyopic patients have developed farsightedness or myopia at an earlier age. Without the help of bifocal glasses, they have to use two separate pairs of prescription glasses. That is really inconvenient if they have to make visual switches between different ranges.

While most people sing the praises of bifocal reading spectacles, this entity is actually far from perfect. Certain problems have been reported on these visual aid devices. Commonly heard ones include headaches, visual dizziness and image jump. What is the reason for these unwanted problems associated with bifocal eyeglasses? In most cases, factors of fashion will not cause problems that are associated with lens function. Those symptoms or side effects are closely linked with visual experience. So, it is the lens design that matters and leads to these bothersome or disappointing problems.

Bifocal eyeglasses now have different lens designs. The original design is Franklin bifocal, followed by variations with added reading segments in different shapes into a primary lens. Reading segments usually account for a small portion of the whole lens. Both of these designs may lead to the mentioned problems. The crossing line on a Franklin bifocal lens will cause frequent image jump. Headache and dizziness are actually subsequences of image jump that occurs from time to time. Bifocals with reading segments have a similar situation. It usually takes a period to adapt to bifocal spectacles.

C: Bifocal eyeglasses bring both significant benefits and unwanted problems. The most common problem is image jump, and subsequently headaches and dizziness will probably follow.

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In today’s eyewear market, the diversified variety of eyeglasses, sunglasses and even goggles may confuse easily customers without much experience. It is true that there are an increasing number of eyewear users with particular fashion awareness who are always trying to select eyeglasses or sunglasses based firstly on their styles or designs. This is completely reasonable in the background that eyewear products in modern times are bringing more and more styling elements when they serve as daily accessories. Yet the other fundamental point is that the vast majority of regular eyeglass users choose eyeglasses according to personal visual needs. Even if a pair of prescription sunglasses or goggles is selected, the function of visual aid should be considered in advance. These two basic aspects make it clear now that choosing a pair of spectacle in these days should evaluate both functional and non-functional factors. This also applies to rimless bifocal reading glasses definitely. What a customer can expect from this type of visual aid.

As stated before, the functional aspect should be given a first place in a customer’s mind. Many people especially the old ones have heard of bifocal reading glasses for sure. Rimless bifocal reading glasses should provide basically vision aids in both near and distance vision zones. This form of multi-functioning seems good for those who really need vision correction when they try to view both close and far objects during a certain period. With a good pair of bifocals, this group of folks does not need to keep two different pairs of prescription glasses during specific tasks. But it is still early to make a positive conclusion. The benefit mentioned before is exactly the upside of these glasses. There is still the downside that some people would report visual discomfort or image jump while using bifocal reading glasses.

The non-functional aspect of expectation associated with rimless bifocal reading glasses involves mainly the frame style. Compared with rimmed and semi-rimless ones, rimless frames have been traditionally thought to be more concise and simple. Only a minimal part of the wearers’ facial beauty will be shielded. Natural and soothing look is equally important for the elderly.

Firmoo.com is the fastest growing online community selling high quality yet cheap eyeglasses, prescription sunglasses and other eyewear. Firmoo’s return and refund policy makes your purchase with Firmoo risk-free.