aspheric lenses
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Aspheric Lenses Aspheric Lenses. Aspheric lenses are defined as lenses that are non-spherical. This non spherical surface encompasses all kinds of lenses from aspheric, atoric, progressive, and aphakic. So if all these lenses fall in the definition of an aspheric lens, how do we further define and differentiate aspheric lenses in all their forms. Aspheric
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- Add to Favorites. 1  Material: Polycarbonate lens. 2  Provides superior protection against nuisance dust, flying particles and liquid splash. 3  Available in two styles, perforated for impact applications, chemical/splash for liquid/impact applications.
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polycarbonate If you are an active person, polycarbonate lenses usually are the best choice for your eyeglasses, sunglasses and sports eyewear. Polycarbonate lenses are thinner and lighter than regular CR-39 plastic lenses. They also offer 100% protection from the sun's harmful UV light and are up to 10 times more impact-resistant than plastic or glass lenses.
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Polarized Sunglasses Polarized sunglasses are specialized eyewear designed to reduce glare from surfaces such as water, snow, and glass. Glare distorts the true color of objects and makes them harder to distinguish.
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Toric Contact Lenses (for Astigmatism) Toric Contact Lenses (for Astigmatism) Lens.com is a proud provider of quality toric contact lenses. By ordering directly from Lens.com, you can take advantage of the same special discount pricing we've been offering our customers since 1995. 1  22+ Years of Online Customer Satisfaction. 2  Over 4 Million Successful Orders Delivered. 3  23+ Million Lenses Ready-to-Ship.
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- Today, most are made of high-tech plastics. These new ones are lighter, don’t break as easily as glass, and can be treated with a filter to shield your eyes from damaging ultraviolet (UV) light. The following lenses are lighter, thinner, and more scratch-resistant than glass or the older plastic types. Polycarbonate.
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Prescription X-Ray Radiation Leaded Eyewear They provide up to 20% more light transmission than any other leaded glass lenses. Our Prescription Radiation Protective Leaded Eyewear comes standard with .75 Pb Lead Equivalency, 1.80 High-Index High-Lite Transmission Lenses. See Plano X-Ray Radiation Leaded Eyewear here.
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Dispensing Trivex, The Decathlete of Lens Materials Ultra-lightweight—Trivex features the lowest density, 1.11, of any optical-grade material on the market. Trivex lenses are, molecule for molecule: Eight percent lighter than polycarbonate; 16 percent lighter than CR-39; 19 percent lighter than high-index. The lightest lens choice for the power range from -3.00D to +3.00D, which encompasses 85 percent of all prescriptions. When dispensed in aspheric or a good free-form design, prescriptions may be made even lighter. Impact Resistance—no ophthalmic-grade lens material is more impact resistant than Trivex.
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Single Vision Lenses Single Vision Lenses. You need single vision lenses if you're either nearsighted or farsighted but not both. Single vision lenses can also correct for astigmatism if needed. An easy way to determine if you need single vision lenses is to look at the ADD column of your prescription. If there are not any numbers in the ADD column of your prescription, then you need single vision lenses and you're in the right place.
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Zenni Optical Review This online eyeglasses store sells standard single-vision lenses, high-index lenses, polycarbonate lenses, polarized lenses with an optional tint, and photochromic or transition lenses. Zenni Optical also accepts progressive and bifocal prescriptions. In addition, all eyeglasses come with a free anti-scratch coating and a UV protective coating.
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Astigmatism Astigmatism, like nearsightedness and farsightedness, usually can be corrected with eyeglasses, contact lenses or refractive surgery. The axis of astigmatism in eyeglass and contact lens prescriptions describes the location of the flatter principal meridian of the eye using the above 180-degree rotary scale.
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- American journal of optometry and archives of American Academy of OptometryDavis, J. K. ( 1957 ). The optics of plano lenses . Amer. J. Optom. , 34 , 540 – 556 .Davis, J.K., The Optics of Plano Lenses, American Journal of Optometry a...
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- Ignore any astigmatism if you have hard contact lenses. A hard contact will correct the shape of the eye by making it more spherical. Therefore, the lens will be of similar strength as your glasses prescription. Take astigmatisms into account if you have soft contact lenses. You will need a toric, or differently-shaped, soft contact lens if you have at least .75D astigma.
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- As with scleral lenses, Laserfit® lenses vault the cornea and are made of highly oxygen permeable polymers, and retain a fluid layer between the lens and the cornea. However, Laserfit® lenses are unique in several respects. They are unique in the way they are fitted. They are unique in how they are designed.
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Aspheric Lens: Aspheric Lens: An aspheric lens is designed for aberration correction. With the help of aspheric lens, the image formed is distortion free. An aspheric lens is a lens whose surfaces profile neither a portion of a sphere nor of a circular cylinder. Since it is not spherical, the conventional processes no longer apply to making aspheric surfaces. This is why aspheric cost many times what spherical surfaces do.
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- Polarized lenses. When sunlight reflects off a horizontal surface like a road, water, snow or any shiny surface it often becomes concentrated horizontally. This is called glare. The vertically-aligned polarizing layer inside a polarized lens blocks virtually 100% of glare. Sunglasses without a polarized lenses do not block glare. Polarized lenses are great for everyday use but highly beifit fishermen, skiers, snowboarders and when driving.
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Aspheric IOLs: from Theory to Practice Aspheric IOLs: from Theory to Practice. SEVERAL ASPHERIC INTRAOCULAR LENSES—lenses in which the front surface is not curved as part of a sphere but is relatively flatter in the periphery—have hit the market and reportedly provide superior contrast sensitivity over the more traditional spherical IOLs.
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- Astigmatism is typically easy to correct with eyeglasses or contact lenses, depending on the degree of corneal curvature. Astigmatism and Contact Lenses. All too many people think that contact lenses are not for astigmatism or that just gas permeable contacts (GPs, RGPs) can correct astigmatic conditions. Not true.stigmatism is typically easy to correct with eyeglasses or contact lenses, depending on the degree of corneal curvature. Astigmatism and Contact Lenses. All too many people think that contact lenses are not for astigmatism or that just gas permeable contacts (GPs, RGPs) can correct astigmatic conditions. Not true.
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- Ambu® aScope™ 3 Slim. The ultra slim single-use videoscope is suitable for an array of endoscopic procedures. It is ideal for placing an ET tube, and a great alternative to a reusable scope. In short, it is a cost-effective way to simplify hospital processes and significantly reduce patient risk. View aScope 3 Slim.
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- Stay at the top of your game. If you're a fan of outdoor sports, you know how much the glare of the sun can affect your performance on the slopes, on the water or on the field. Polarized lenses offer amazing glare reduction in high light conditions and outstanding UV protection. Back to Lenses.
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Eyeglass Lens Coatings: Anti-Reflective, Scratch-Resistant, Anti-Fog and UV Anti-Reflective Coating. Anti-reflective coating (also called AR coating or anti-glare coating) is a microscopically thin multilayer coating that eliminates reflections from the front and back surface of eyeglass lenses.
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- Astigmatism is a common eye condition that's usually corrected by eyeglasses, contact lenses, or surgery. Astigmatism is caused by an eye that is not completely round and occurs in nearly everybody to some degree. For vision problems due to astigmatism, glasses, contact lenses, and even vision correction procedures are all possible treatment options. A person's eye is naturally shaped like a sphere. Under normal circumstances, when light enters the eye, it refracts, or bends evenly, creating a clear view of the object.
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- .75 mm polarized lenses. These polarized lenses are made from thin sheets of film and are the best option when you don’t need to worry about impact resistance. The .75 mm lenses are good for most casual sports, like running and golf.
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Clariti Monthly Toric - Includes Vision Care CooperVision’s (formerly Sauflon) Clariti Monthly Toric contact lenses are designed to provide great levels of comfort for wearers with astigmatism. The silicone hydrogel material ensures higher levels of oxygen reaches your eye, increasing comfort. A high-quality UV inhibitor protects your eyes from harmful sun rays.
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- You’ll see more of the world. iD Single Vision lenses are the first to integrate your lens design on both the front and back surfaces, so you can see more clearly in all directions. Traditionally made single vision lenses have a constant curvature across the front surface, which makes peripheral vision almost impossible.
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- 1 Trivex lenses. 2  These lenses are made from a newer plastic with similar characteristics of polycarbonate lenses. 3  They are lightweight, thin, and impact-resistant and may result in better vision correction than the polycarbonate lenses for some people. 4  High index plastic lenses.