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There are two products in my fitting set: High Definition Aspheric and HDX Progressive. Can I combine the two lenses?
A:
For a fitting of early presbyopes up to +1.50 add, sometimes you can expect better results when you fit a High Definition Aspheric lens on the dominant eye (add +0.50 to the SE) and HDX Progressive on non-dominant eye (right on SE). When the patients
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We have a lot of monovision patients in our practice. Is there any benefit in using the High Definition Aspheric lenses for this purpose?
A:
Yes, definitely. Thanks to the High Definition Aspheric optics that provides extra sharp overall vision all you need to do is bump the plus on dominant eye by 0.50 diopter and the non dominant eye by half the add power. The result is improved binocul
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How do PolyVue High Definition Aspheric lenses minimize spherical aberration?
A:
In order for a soft contact lens to be effective in reducing spherical aberration caused by lens power and flexure on the eye, the amount of spherical-aberration-reducing curvature must vary with the power and thickness of the lens, and be compensate
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Does Essilor still make aspheric polycarbonate?
A:
I think all airwears are aspheric, I know that some of them are, for example I have sitting here a transition airwear and it is an aspheric lens. Can't say for sure though.
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What is aspheric?
A:
An aspheric lens uses a parabolic curvature versus a spherical curvature. It has two benefits, one is that it reduces the thickness of a lens making it lighter and more cosmetically appealing, secondly it reduces magnification (or minification) makin
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Are the High-X 1.67 lenses aspheric or non-aspheric?
A:
The Finished Single Vision are aspheric, the SFSV and D-28s are not; they are spherical in design. How do you know what the intermediate power is on a trifocal lens? Typically the intermediate power would be 50% of the prescribed add power. Other add
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What is the difference between an aspheric & non-aspheric lens?
A:
The front surface of an aspheric lens has curves that gradually flatten or steepen as they move away from the optical center of the lens. A non-aspheric or spherical lens has the same radius curve over the entire surface. Aspheric lenses will provide
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What does aspheric mean?
A:
An aspheric lens is a magnifying lens with a surface profile that is neither a portion of a sphere nor of a circular cylinder. This more complex surface can eliminate spherical aberrations as well as other optical aberrations. The aspheric lens is sm
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