Eye Care Blog

Eyesight is one of the most important sensory powers that living souls are blessed with. But nowadays many people have to wear reading eyeglasses and now in order to be more competitive, many producers develops plenty of discount ones.

Specifically, as we age the eye muscles continue to develop and lose the primary elasticity necessary for 20/20 eyesight and that is why we have to maintain things at arms length to read them. Presbyopia is definitely not equivalent to long or short vision that requires prescribed contact lenses; it is only a natural component of aging.

There are three different kinds of reading spectacles. The 1st kind will be the full reading glasses which are usually the most appropriate prescription glasses for using a lot of time focusing on materials close-up. But if you look around the room through these types of eyeglasses, subsequently everything will certainly seem blurry. The 2nd type is a half-eye which usually sit down on the nasal area. These encompass a singular appeal. Regarding near work, you are able to look down and through the lens. To see subjects well away, all you have to do, is to look above those glasses. Yet another kind is the tinted reading eyeglasses. They come with Ultra-violet safeguards and are also your perfect choice when venturing out in the sun.

If you happen to have problems with unexplained headaches when making crafts, or reading, as well as using a pc, and also blurry sight you may well be feeling the onset of presbyopia, nevertheless the good news is that some reading glasses will in all probability resolve the issue immediately.

Reading eyewear employs a low magnification, though the lens are designed specifically to magnify objects or words at around fourteen inches from the eyes, this would be the typical distance a lot of people find browsing publications to be adequate.

Pharmacies usually sell reading glasses, and many use a small chart hanging on a wall or the stand the glasses were exhibited on, permitting individuals to swiftly determine the dioptic strength of lens required, these days reading glasses can be obtained over the counter through food markets, discount merchants, sunglasses stores, from the web, even several fashion stores may carry their own personal variety.

Recently styles of reading eyeglasses have come quite a long way along with big designer companies and shades manufacturers incorporating reading glasses to the product brochures, and in the process redefining the cool factor, gone are the days from low priced plastic frames and rectangular lenses, currently reading eyeglasses for men and women come in almost all styles to match your face structure along with individuality.

Many people may have the misconception that the discount reading glasses do not have trustful quality. In fact, it is not ture.

Have you ever troubled by the problem that you can’t see clearly even if you have got a pair of glasses? If you were, now you have the opportunity to get rid of it. Because bifocal reading glasses will return you a pair of clear eyes.

Spectacles together with contact lenses are considered some of the most innovative products today. Their function is quite valuable as they are tools for helping people to see much clearly and conveniently. Compare to contact lenses, spectacles offer more convenience to people age 40 and up.

Styles and Designs

Spectacles can come in wide variety of styles and designs and they can be bought in high-end fashion stores, local eye care center and even online. These eyeglasses are available for both men and women. They can have classy feminine frames or thick metal frames. The styles vary from retro to modern style. One great example is the tinted reading glasses that are bifocal. Basically, they are sold in four distinctive designs depending on the method use for embedding the lenses.

Origin of Bifocals

As their name implies, spectacles are eyeglasses with two distinct optical powers. They are designed for individuals with symptoms myopia or astigmatism. The eyeglasses were invented way back around 1760. They are first developed or used by Benjamin Franklin, an American statesman and investor. During this time, Benjamin suffered from presbyopia and nearsightedness. This inspired him to create his own eyeglasses.

The Benefits of Bifocals

Spectacles are designed to allow the user to improve his focus on a certain object either far or near him. Presbyopia is a condition where in a person suffers from the difficulty of focusing objects that are far and near. The spectacles provide an ease of transition from focusing onto far objects to near objects. They have two sections on each lens. The upper section is expected to aid in distance vision while the lower section magnifies objects. With this kind of lens, you do not need two sets of eyeglasses as the spectacles provide everything you need.

At last, due to that more and more people at a young age suffer from impaired vision the demand for bifocal reading glasses is high in order to have a clear seeing.

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Bifocal reading glasses are a special category of prescription glasses. The most outstanding feature of them is that one bifocal lens has two separate powers. The upper power is used to correct nearsightedness and the lower power is for presbyopia. Compared with single vision reading glasses, bifocal glasses can still offer vision correction for nearsighted individuals. This is the most widely recognized advantage kept by bifocal glasses. In fact, bifocal reading glasses differ from reading glasses only in lens power. Other factors such as eyeglass frame materials and lens materials are almost the same. For instance, there are available plastic frame bifocal reading glasses as well as metal frame ones. The difference is similar to other forms of glasses that plastic frame bifocal reading glasses are often slighter. This articles focuses on introducing shortcomings of bifocal glasses, including plastic frame ones.

A superficial problem associated with bifocal glasses is that there is a visible line usually sitting in the center of the lens horizontally. Even the newly developed designs including the D-segment have still visible line or lines for power separation. What is the concern? In an obvious way, these visible lines on the lenses are always telling other individuals that the wearer need reading glasses, which is resulted from presbyopia. This condition is always associated with aging, so that reading glasses are sometimes considered as the symbol of an old age. For most individuals who are still in their middle ages, such an obvious expression caused by visible lines is really unwanted. In addition, these visible lines will surely compromise the wearer’s charming look. From this viewing point, bifocal reading glasses are quite similar to trifocal ones.

A functional shortcoming of bifocal glasses is visual distortion. In some instances, new users of bifocal reading glasses need a few days to make an adaption. In serious cases, even headaches and dizziness will be caused. For certain individuals, these reactions even persist for a long time. In fact, these symptoms are caused by the two separated powers in a single lens. A power for nearsightedness and the other one for presbyopia are strictly and suddenly separated using the center line described above. Such an obvious separation or jump will cause some people to experience visual discomfort. In fact, another functional shortcoming is that bifocal reading glasses can not deal with computer tasks professionally. This factor can be resolved by trifocal glasses. All these mentioned shortcomings are equally true in plastic frame reading glasses.

Formally called progressive addition lenses (PAL), progressive lenses are the essential part of a pair of progressive reading glasses. These special reading glasses have won its fame because of incomparable features of these progressive lenses. In some cases, progressive lenses are also called progressive power lenses, graduated lenses, no-line bifocals and varifocal lenses. All of these variations indicate some features of progressive reading glasses. For instance, the names including progressive power lenses, varifocal lenses and graduated lenses suggest that these lenses have a gradient of increasing lens powers, helping the users correct other refractive errors. Such a gradient starts at a minimum at the top of the lens and reaches a maximum addition power at the bottom of the lens. Typically, the length of the power gradient on the lens surface usually stretches 15 to 22 mm. And the additional power is usually between 1.00 and 2.50 diopters. In addition, the name of no-line bifocals suggests that progressive lenses are superior to bifocal lenses. They will never exert visible lines on the wearer’s face. In this case, progressive reading glasses can also be named as no line bifocal reading glasses.

Evidence shows that the first commercially available progressive lenses were developed by Duke Elder in 1922. Sold by Gowlland of Montreal, these lenses were based on an arrangement of aspheric surfaces. Progressive lenses of a modern design could be seen only after the invention of Varilux lens, which was developed by Bernard Maitenaz and patented in 1953. It is understandable that those progressive reading glasses had relatively crude design and workmanship. Nowadays, progressive reading glasses are more mature and they have gained greater patient acceptance. In general, there are three vision zones in a progressive lens for near vision, distance vision and intermediate vision respectively. The near zone usually sits at the bottom; the distance section is usually situated at the top part; and the intermediate section is between the first two. Modern technologically advancements have developed several variations of such a basic design. For instance, progressive lenses can be customized for computer use. Moreover, they can be made of enlarged near or distance section. These customized progressive reading glasses are a great help for individuals with particular occupations.

Modern technologies used by manufacturers are still trying to minimize unwanted aberrations on progressive reading glasses. They improve mathematical modeling of surfaces and conduct extensive wearer trials. Furthermore, computer-controlled machines are used to cut the complex surfaces of a progressive lens.

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.