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A Revolution in Glasses Is Underway

December 6, 2010
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Eyeglasses, as they are used today, are not ideal solutions he says, because what you gain in eyesight magnification you lose in clarity and focus. It's a problem that has plagued generations of eyeglass wearers, but Zalevsky believes he has found a better way.

“Spectacles” have been around for at least 700 years by most reckonings, and they seem to have been doing an adequate job of compensating for presbyopia, myopia and other common eye ailments. But that's not always necessarily the case, Zalevsky says. For example, bifocals and multifocals, which are popular among older wearers, have several disadvantages. They simply draw the eye to the appropriate spot on the lens, while limiting the focus as regular glasses do. They also reduce the usable field of view. And while the refractive lenses used in most eyeglasses limit focus, diffractive lenses—which could solve the focus issue by increasing focal depth—have their own problems, such as color integrity distortion and low energetic efficiency.

Rather than make do with the partial solutions available today, Zalevsky suggests a monofocal lens which can focus light from between 13 inches away up to the horizon. The lens is engraved with special patterns which shifts the phase of light waves, enabling clear focus on objects both near and far.

“We call this an interferometric solution, combining the best of refractive and diffractive lenses,” Zalevsky says. The solution consists of a single lens that enables wearers to see more clearly, no matter what their vision problem (presbyopia, astigmatism, etc.) or whether they wear glasses, contact lenses or intraocular lenses.

“If you wear bifocals, you will no longer have to move your head up and down to access the near or far vision areas—one pair of glasses with our interferometric solution will do the job,” he promises.

His company, Petah Tikvah-based Xceed Imaging, has a dozen employees and has been in business since he helped found it in 2007. The company was started with private funding and now has a development agreement with Bar-Ilan University. Zalevsky hopes that the first lenses based on his interferometric solution will hit the market within six months to a year.

“I believe this solution will help many people who in the past were only able to receive partial relief for their vision problems,” he asserts.

Xceed Imaging has commercialized the technology and is now conducting clinical trials which Zalevsky says have “proven very successful”. “We hope to be able to market the lenses in the very near future,” he says.

One group whom he expects will welcome the lenses is those suffering from astigmatism [out-of-focus vision, making it hard to see fine details], especially irregular astigmatism (where light is distorted in irregular patterns). Zalevsky says that Xceed's products will greatly enhance focus for all astigmatism sufferers—including those with an irregular astigmatism condition.

In addition to the interferometric lens solution, Zalevsky is an inventor of note who has developed other winning ideas through better engineering. In 2008, Zalevsky won the International Commission for Optics' 2008 prize “for his achievements and significant contribution in the field of optical super resolution.”
 

Posted on December 6, 2010

Source: (Excerpts of an article by David Shamah, Israel21c, December 5, 2010)

Photo Credit: en.wikipedia.org

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