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Aspheric lenses have come as a huge relief to high prescription patients who had to earlier make do with spherical lenses that magnify the eyes and are unattractive. Aspheric lenses are a superior alternative

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The Aspheric Advantage It is quite remarkable how aspheric lenses have changed the game in the optical business. Optical professionals across the world have taken to aspheric lenses. There are some distinct advantages in using aspheric lenses, even though they are more expensive than conventional lenses. Let’s list and preview these advantages:

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Product-wise There are many companies in the market that make aspheric lenses. But, for some people, precision that is generated through expertise and experience can be found only amongst the top gear lens companies, such as Essilor, Zeiss and Nikon. Let’s examine what these companies have on offer.

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Essilor’s Airwear Essilor’s emphasis on clarity of vision, eye health care, safety and comfort ensures that the spectacle lenses it offers are impact resistant, lighter and thinner. Essilor’s special range of aspheric design is called the Airwear series. With a tagline that says, ‘lighter, safer and greener’, it explains the company’s commitment to long-lasting good eyewear. With the focus being on lightness and strength that are combined together to make the final product, Essilor brings to the table a special range of aspheric spectacle lenses. With a refractive index of 1.59 along with the aspheric design, Essilor states that the Airwear series is 30 per cent lighter and 25 per cent thinner than other lower index lenses. All spectacle lenses in minus power that are over 2D, have a centre thickness of 1.3 mm. Airwear spectacle lenses score in a few other areas as well. According to the company, it absorbs 100 per cent of the harmful UV rays. It also comes with a tough hard coat called ‘Titus’ that absorbs shocks, making this one of the most preferred scratch-resistant options in the range. This strength of Airwear spectacle lenses makes it best suited for any activity or occasion, from driving to high-activity ridden daily chores.

Lenses Of Aspheric Aspheric lenses are best made with high-index materials. The combination is potent, resulting in slimmer and lighter lenses. The difference between aspheric and conventional lenses is most noticeable in ‘plus’ lenses. Aspheric lenses can also be made for ‘minus’ lenses. The thickness of a ‘minus’ lens is maximum at the edges and reduces towards the centre. When aspheric lenses are used for ‘minus’ lenses, the difference is less visibly dramatic.

Dispensing Rules For Aspherics Perfection is everything when it comes to aspherics. A well-designed aspheric lens can result in excellent optical and cosmetic results. But aspherics are not as forgiving of dispensing errors as spherical lenses. If an aspheric lens is fit incorrectly, the lens may end up being optically worse than a conventional lens would have been. That’s why dispensing rules become more crucial for aspherics.

ZEISS was Europe’s first manufacturer of plastic lens to have successfully polymerised a plastic lens with the super-high index 1.665 for batch production. Since the polymerisation is done in-house, it is possible for ZEISS to provide such a quality product. The range is available in 1.74, 1.67, 1.6 and 1.5.

Things To Remember While the advantages of aspheric lenses are aplenty, there are a few key things to remember before recommending aspheric lenses to patients.

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ZEISS Single Vision AS The ZEISS Single Vision AS is an aspheric design crafted on a plastic base. It is rotationally symmetrical, has a flatter front and has superior visual quality. It is much thinner and flatter than the ZEISS Single Vision spheric lens. It is in fact 20 per cent thinner and lighter. The ZEISS Single Vision AS offers greater visual comfort and is aesthetically fine-tuned as well. There are two distinct advantages in wearing this lens. As the material used is plastic, it is an ideal option for children needing to wear corrective glasses. It is also ideal for sports professionals who would benefit largely because of its unbreakable quality.

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Aspheric lenses have been a major breakthrough in the optical industry offering patients with high prescription, eyewear that is lightweight, distortion free, thinner and that offers more cosmetic value.

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What is an aspheric lens? Is it a kind of lens? How is it different from polycarbonate or Trivex? These two are lens materials and undoubtedly the best in the business. But aspheric is a lens design. So what is so special about this design? Well, to begin with, let’s understand the difference between spherical and aspherical lenses. A spherical lens is when the lens is thickest at the centre and gradually thins as it fans out till the end. This is the most used design in all corrective lenses. The problem is, when the correction is for farsightedness the lens is really thick at the centre. This makes the eyeglass look a trifle ‘bulgy’ at the centre and thereby, a mite unattractive. With aspheric lenses, this issue of ‘bulginess’ is rectified. How? Simple, aspheric lenses have a more complex front surface that gradually changes in curvature from the centre of the lens to the edge. This ensures that the ‘centre thickness’ does not exist. Aspheric glasses mean fat is out, thin is in.

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Nikon Lite AS Nikon is an expert in aspheric design. In fact, the unique aspheric design for eyeglasses is said to be borrowed from Nikon camera lenses and is considered as one of Nikon’s most outstanding achievements. Nikon recommends Nikon Lite AS for low to middle prescription wearers. The range is available in 1.5,1.56, 1.6, 1.67 and 1.74. All the Nikon Single Vision Lenses feature Nikon’s Advanced Aspheric Design. The bottom line promise is that the lens will not just be thinner, lighter and flatter and offer sharp, clear vision, it will look good and have limited peripheral distortion.