However, some people do find that when looking out from the non-central parts of the lens, their vision is distorted, and it is often this, combined with getting used to positioning the head differently for close and far viewing, that puts people off of using varifocals. With advances in modern technology, varifocals have been created with larger reading portions (or far distance portions) of the lens, as well as varying sizes of corridor. This allows you to chose the type of lens that would best suit your lifestyle and needs. A shallow frame varifocal has also been developed to allow varifocal wearers to keep up with the current trend for narrow frames.

Varifocals eliminate the need for carrying two pairs of glasses (one for reading and one pair for distance viewing), as well as providing a means to view objects at all distances in clarity by allowing you the selection of prescription strengths in the corridor portion of the lens. With a bit of perseverance and determination in the first few weeks of obtaining new varifocals, you will have your vision improved above and beyond what you could ever have hoped for!

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This is probably one of the reasons why varifocals have become so popular. With all the new styles in glasses frames and unique tints, varifocals as much as any other type of glasses can be flattering and stylish. From a vanity point of view, because the glasses hide the magnification gradients, they look young and sophisticated on the wearer – in fact just like an ordinary pair of glasses. The most powerful case for varifocals is it takes away the need for two pairs of glasses. No longer does the wearer have to switch perpetually between reading and long distance glasses. The days of trying to remember where you last left your reading glasses are gone. You can now wear one pair of glasses which allow you to see well whilst taking part in all activities whether it calls for infinite detail or sight seeing.

The type of prescription glasses that falls between everyday glasses and varifocals is bifocals. Up until the 1950′s when varifocals were invented bifocals were the darlings of the spectacle world. But at the end of the day they were only ever two sets of glasses within one glasses frame. True they got rid of the problem of having too many pairs of glasses but the look was stilted and the way the eye had to adapt to a sudden change in magnification was not perfect. The other problem with bifocals is they offer just two ranges – near and far. Varifocals, because they change through a range of magnification offer magnification for far, intermediate and near distances.

Varifocal lenses are especially effective because they use a progressive range of magnification that is designed in accordance with every patients’ individual and unique vision needs. As a person focuses on an object, their eyes move up and down as they focus and locate the proper magnification on the glasses. When an image becomes clear, the eyes stop at that point. At first it takes a time for the user to get used to the changes in magnification that are automatically occurring but after three or four weeks it usually becomes second nature.

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When you are selecting progressive lenses, it is also very important to select the one that fits you comfortably for both distance and near viewing. There are specialists on the market, who can provide you the best compact designs, which will help you in larger reading, as they are provided with short corridor designs that will translate into smaller viewing. Moreover, it is also very comfortable and fashionable to wear these glasses. As the demand of these lenses is increasing, the manufactures are also providing different styles and colors of glasses. With these bright colors, you look very fashionable.

Finally, it is very important to select the right brand when you are buying progressive lenses. As there are many low quality glasses available on the market today, it is very important to buy these glasses form a reputed brand.

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As the name reflects, a bifocal lens has only two focal points: one for close reading and the other for distance vision. Bifocal lenses provide very little help in dealing with computer work, which requires special intermediate vision. Some bifocal wearers try to see objects in intermediate range by bobbing their heads up and down. In this way, long period of computer use is much more likely to cause computer vision syndrome. Bifocals force computer users to maintain an unnatural posture, resulting in muscle strain, neck pain and so on.

Progressive lenses provide a smooth, seamless progression of many lens powers, bringing comfortable vision at truly multiple distances. Presbyopic patients just need to look straight ahead to see in the distance, move eyes slightly downward to get intermediate vision and lower their gaze a bit further to manage near tasks. They never need to bob head up and down or keep uncomfortable postures.

“Image jump” is a bothersome womens vision problem commonly aroused by bifocal or trifocal lenses because of their separate, sudden power gaps. Moving sight across these visible lines of bifocals or trifocals, a wearer is probably to experience an image jump. In addition, trifocal and bifocal lenses only provide clear images within a specific range of distances. Beyond that, burry vision may occur. Progressive lenses avoid all these problems by providing a comfortable prescription transition. Discomfort of progressive lenses can be burry peripheral vision in some first-time wearers.

The wide spread of progressive lenses in the United States has promoted the advancement of lens technologies. Today, progressive lenses with wider intermediate and reading parts are available. And special occupational designs especially for computer work are also provided. Modern progressive lenses bring fewer peripheral aberrations by applying wavefront-guided technology. New progressive lenses are also compatible with smaller lens frames, which was unfeasible in the past. These small lens designs offer more fashionable options.

Materials such as high-index plastic glasses and impact-resistant polycarbonate have been used to produce progressive lenses now. Anti-reflective coatings on progressive lenses reduce distracting lens reflections and provide more attractive appearance. Progressive lenses are also available in photochromic and polarized types.

With such a wide range of options, you may ask a professional optician for advice.

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The lenses used in sunglasses are very important for providing proper protection for the eyes. With the advancements in the glass manufacturing technology, different types of lenses are used in glasses. Each and every type caters to different needs. You have to know about the lenses to choose the glass for your purpose.

Lenses are made of plastic or glass. Plastic lenses are light weight made of plastic material that can be tinted with different colors of your choice. They block 80% of UV rays thus providing good protection from the sun. Glass lenses are more prone to scratches but they have excellent inherent optical quality.

Polycarbonate lenses are widely used in sunglasses these days. They provide 100% sun blocking. They are very light and they don’t shatter very easily. Polycarbonate lenses are perfect for sporty glasses and children sunglasses as they are scratch resistant.

High index lenses are made of high index plastic material. They are widely used for cosmetic purposes as they are very thin. Like polycarbonate lenses, the high index lenses provide 100% protection from the harmful rays of the sun. High index lenses must have anti reflective coating because the surface reflections increase with the increase in the index of the lens.

Aspheric lenses are best suitable for people who need to wear high prescription glasses. In this type of lens the thickness of the lens is evenly distributed compared to the conventional lenses. Thus they provide very clear vision and also give you a stylish look. For light weight glasses, aspheric lenses are made with the high index material.

Photochromic lenses have the property to control the light entering the eye irrespective of the conditions prevailing outside. When you alternate between indoor and outdoor you have to choose these lenses to reduce the strain on the pupil of the eyes.

Polarized lenses are perfect for an outdoor aficionado. They greatly reduce the glare by canceling the rays due to reflection from the flat surface. These lenses can be used when you are engaged in driving, golfing, skiing, and so on.

Any glass must provide you protection from the harmful UVA and UVB rays of the sun. When you go out your eyes are exposed to the hard sun. So ensure that your lenses have proper UV coating. If your lens is made of polycarbonate or high index plastic, then you need not worry about UV protection as these materials inherently block the sun.

When you want your conventional prescription glasses to look thin and light weight you may consider the use of aspheric lenses or high index plastic lenses. Use of smaller frames may also add to the style.

Scratch resistant coating (SRC) is essential for all lenses to prevent the lenses from getting scratches very often. Polycarbonate and high index lenses come with this SRC coating by default.

Anti reflective coating (ARC) is essential for certain type of lenses like high index plastic to reduce the reflective rays. Glasses with this coating eliminated glare caused during driving in the night and staring at the computer. But glasses that have this ARC are prone to scratch and hence ARC and SRC are mutually exclusive. You cannot have both coatings on the same lens.

To improve the look and to see the world in your favorite color, you can add tints to your lenses. Many adults are now tinting their lenses with their favorite colors. Tints can be effectively applied to plastic lenses. The tints will be absorbed uniformly in plastic lenses. Glass lenses cannot be tinted uniformly and are more difficult to tint. High index plastic lenses are easier to tint than polycarbonate lenses. Lenses that have coatings such as ARC and SRC cannot be tinted as the color will not apply uniformly on the coating. If you want to tint, then you must remove the coatings, tint the lens and then reapply the coating. Tints may add style to your glass but you must ensure that your lenses are provided UV coating to protect your eyes. More than a fashion eyewear, the glass you wear must provide clear vision and proper protection for your eyes.

Author : Aakash Shah

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• The first of them are the Single Vision Lens which is mainly characterized with having the same power from the top to the bottom of the lens. People suffering from astigmatism, presbyopia and myopia can go for the use of these lenses in order to correct these vision problems. Astigmatism is a disease when enough light does not reflect on your retina and thus images are visualized distortedly.
•  Then comes the bifocal lenses which are mainly used to correct the problem of presbyopia. This disorder happens when people suffer problems of nearsightedness. This is a vision disorder which usually tends to arise after 40 years of age. When a person is diagnosed with presbyopia it is difficult for them to focus on close objects. This is when one can take the help of bifocals. It helps you to see distant objects from the top of the lens and through the bottom portion of the lens you can correct your close vision. It should be always kept in mind that people with presbyopia has to accommodate both types of focal view on their lenses.
• The third type of lenses is the trifocal lenses. These lenses have a unique feature of three focal points and are very similar to the bifocal lenses. The three focal points include the top of the lens which helps to see the distant objects, the lower part of the lens which helps in seeing the near objects and the middle part which provides the intermediate vision.
• The fourth types of lens available in the market are the multifocal lenses. These lenses also have more than one point of focus. The bifocal lenses and the trifocal lenses are types of multifocal lenses.

The other types of lenses available are the computer lenses which are specially designed to protect your eyes from harmful effect of using computers for prolonged hours. These lenses help you in viewing the computer screen and the text on the computer screen for a long time. Another type of lens available are the Double Bifocal lenses which are usually recommended to the pilots, electricians and other professionals who have to work at a close vision overhead.

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The different types of lenses are:

• Single vision lens which has the same optical correction over the entire area.
• Bifocal lenses are lenses in which the upper potion is generally for distant vision and the lower portion is for near vision. But there is a segment line between the two.
• A trifocal lens is similar to a bifocal lens. The only exception is that there are two segment lines dividing the three different correcting segments.
• Progressive lenses provide a smooth transition from distance correction to near correction eliminating the lines in between enabling a clear intermediate vision.

The most common shape of corrective lenses is ophthalmic or convex-concave. These lenses have the same radius from the back and the front. The difference in the curvature between the front and the back of the lens leads to the corrective nature of these lenses. The bifocals and the trifocals are more complex lens shape, whereas the progressive lenses eliminate the line which is there in the bifocals and the trifocals. The base curve can be changed in order to give the best optic and the cosmetic characteristics across the entire lens.

The greatest cosmetic effect that has come up in the recent years is that of reduction in lens thickness. This results in the increase in material density. The lenses are made from plastics, polycarbonates and high index plastics called the polyurethanes. The lenses can have a scratch resistant coating, an anti glare coating and a coating for protection from ultraviolet rays of the sun.

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Now it is time for you to choose the right frame for your progressive lens. Previously the frames were of a large size in order to accommodate the area of focus of the progressive lenses. In case of too small lens the reading portion were cut off thus destroying the purpose of wearing these lenses.

Today there are different types of progressive lenses available in the market. The difference in lenses is due to the difference in central corridor of the optimum vision. This corridor is expanded in different lenses. The progressive lenses made from extensive use of computers have a wider range of intermediate zone. It is then for you and your eye physician to choose which lens fits your face the most. Progressive lenses are available in plastic and glass and also polycarbonate, high-index and photochromic lenses. Adaptation to progressive lenses can take from a few minutes to a few days. People with some specific type of eye corrections can take some longer to get adjusted to these lenses.

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Chances are, if you saw clearly up until you reached your early forties you are noticing a condition called presbyopia. Do not worry; everybody experiences presbyopia at some point. Let us skip all the scientific reasoning presbyopia is doing this to you and just accept that it is natural, it happens, and this is reality. Easiest thing you can do is get glasses to correct for your new found fuzzy reading vision.

There are three general styles of eyeglasses you might be interested in using.

1) Single vision reading glasses are easy to use and are easily available. Readers have your reading correction covering the entire lens. This means that they are to be used only for near vision. If you look off in the distance through your reading glasses it will be blurry. If you see better in the distance through your reading glasses, go visit the eye doctor. Chances are you need a prescription pair of glasses or contact lenses.

2) Bifocal reading glasses are split lenses with no correction through the upper portion and your reading correction throughout the lower portion of the lens. Commonly referred to as Ben Franklin Glasses, these eyeglasses are perfect the reader who wants to leave glasses on for an extended period of time and still be able to see clearly in the distance.

3) Progressive reading glasses have the same benefit as bifocals, except rather than having a split style lens; they have a gradual channel of increasing reading add. To achieve an optimal graduated effect with your progressive readers, you may want to pick out a nice frame and bring them to a qualified optician to have the progressive lenses added in your correction.

For most presbyopic readers, either single vision or bifocal reading glasses makes the most sense. Remember that your new vision is natural, but that does not mean you can skip the visit to the eye doctor. Consider presbyopia a wake up call that you should have your eyes checked and get yourself a nice pair of readers that you will be proud to wear.

Suzanne Hughes writes quality information to help you navigate through the vision maze of life. She recently added a custom line of bifocal reading glasses to the existing line of reading glasses available at the online reading glasses boutique http://www.ReadinStyle.com

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