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Single Vision Plastic Lens Single vision lenses are prescribed if you need correction for one field of vision, either for distance or items up-close.EEC offers a number of options for the single-vision
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Bifocals, Tri-focals and ProgressivesBifocal lenses are prescribed if you need correction for both distance and near vision. Trifocals provide correction for three fields of vision, including distance, near and intermediate, all in one lens. When more than one field of vision requires correction, these types of lenses are called "multifocals."For more natural vision there are progressive lenses. This lens offers a smooth transition from distance to intermediate to near without any visual jumps or tell-tale lines. Progressives also look great on your face, since no one can tell you are wearing multifocal lenses.
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Indoor Vision And
Beyond (Office Lens)
Today, almost all office transitions are conducted through computer
technology. Constant work in front of a computer has created
numerous health side effects. Compauter Vision Sydrome is one of
them. Although it is not a disease, this condition impairs vision as
well as creates discomforting othopedic problems. As a result, a
sound optic solution is called for to eliminate Computer Vision
Syndrome's problems.
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| OUR LENS CATALOGUE : SOLA SINGLE VISION
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OFFICE LOW SHIFT YOUNGER IMAGE CLEAR SUNSER FD 28 AO COMPACT KODAK SILOR FD28 ASL 1.53 RLX PLUS
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Choosing a lens material Hard resin lenses are good for most people. Polycarbonate lenses are virtually shatterproof, and are highly recommended for children and adults in active situations. In general, if the sphere on your prescription is at +/-2.00 or lower, you will not benefit from the more expensive 'thin' lens types (described below). Hard resin or polycarbonate lenses will be just fine for you. If the sphere on your prescription is higher than +/-2.00, you will benefit from the selection of a 'thin' lens type. Thinner lenses have three advantages: they do not look 'thick', they do not magnify or minify your eyes when seen by others, and they are lighter. In general, the thinner and lighter the lens, the more expensive it will be. 'High index' is the most common 'thin' lens material, and 'aspheric' is the most common 'thin' lens design. You will not notice any difference in your vision between these two types of lenses, and your eye doctor can explain if one type may benefit you more than the other. Polycarbonate lenses can be purchased as 'aspheric', giving you the advantage of polycarbonate¡¯s strength together with aspheric¡¯s thinness. The thinness of high index lenses is characterized by the 'index of refraction' (IR). Mid-high index lenses are commonly around a 1.56, high index lenses are around 1.60, and ultra-high index lenses are 1.66 and above. After you have selected the best lens material for your personal situation, you can choose among other lens features and options, like sun-sensitive, scratch coating, anti-reflective coating, and UV protection (UV protection is always inherent in high index and polycarbonate lenses). If you want sunglasses, additional options could include tint, polarization, and mirror coatings. Additional lens services would include a mounting fee (applies only for rimless frames), and rolling and polishing (applies only to higher power lenses being mounted in certain frame types). How thin are the thin lenses? How thick are the thick ones? Plastic lenses must have at least a 2.0 mm center thickness according to US law. The thickness at the lens edge depends on the strength of your prescription, your pupillary distance, the eye size of the frame, and the lens material. Because of all of these factors, it is nearly impossible to select a lens by its 'thinness'. In general, the thinner and lighter the lens, the more expensive it will be. To make the optimal thickness/price choice for your personal situation, use the chart below as a guideline. You can choose to spend less money and have a thicker lens, or more money to have a thinner lens. Also, within the mid-high index, high index, and ultra-high index categories you can also choose an aspheric design for additional thinness. |
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How are lenses made? Every lens starts out the same way¡ªas a solid block of material (called a 'semi-finished blank'). Sophisticated machines then carve and polish the back surface of the semi-finished blank, and the resulting shape determines the lens¡¯s prescription. Once a semi-finished blank has been surfaced, it is called a 'finished blank'. The finished blank is then 'edged': it is inserted into an edging machine along with the frame. The edging machine analyzes the frame, and the cuts the finished blank to the exact shape of the eyeglasses lens, while positioning the optical center in front of each pupil. Lens manufacturers can sell semi-finished blanks and finished blanks. A lens laboratory can purchase semi-finished blanks and do the surfacing themselves. A lens laboratory can also purchase finished blanks, and only do the edging and mounting. If a finished blank is purchased from a lens manufacturer, it is called a 'stock lens'. Does it matter which lens brand I choose? Your choice of lens brand is a personal decision, which is generally a tradeoff between price and quality. As in other areas, better quality brand merchandise is more expensive. In lenses, a more expensive lens usually means a better quality lens, or a lens with a wider viewing area (in the case of progressive lenses). In some cases however, it may be difficult or impossible for a consumer to notice the difference between a high quality lens and a low quality lens. Anti-reflective and scratch-resistance coatings typically adhere better to the lens if they are applied by the lens manufacturer than if it is applied by a lens laboratory. |
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