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Medical Forum / General / Vision / February 2005Hoya 1.71 versus 1.70 (Robert?)
Hi, I just purchased a pair of glasses with the Hoya 1.70 Evry lenses. This is what I use for distance. I have a pair of Hoya's I got back in 2003 also that I used for the comptuer. These are supposedly the Hoya 1.71 Teslaid that they stopped making. I switch between these two. Will this create a problem? Are their different properties in these lenses? My Rx is about -9 and -1 astigmatism. Thanks, Bill >Hi, >I just purchased a pair of glasses with the Hoya 1.70 Evry lenses. >This is what I use for distance. I have a pair of Hoya's I got back in >2003 also that I used for the comptuer. These are supposedly the Hoya >1.71 Teslaid that they stopped making. I switch between these two. >Will this create a problem? Not if they are made properly and are the same Rx. >Are their different properties in these >lenses? My Rx is about -9 and -1 astigmatism. >Thanks, >Bill I'am pretty sure that the abbe number is the same at 36. I believe that the specific gravity is slightly lower with the 1.70, around 1.35g.cm3. Both are available with an aspheric design. Hope this helps Robert Martellaro ~~~~~~~~~~~~~~~~~~ Optician/Owner Roberts Optical robopt@execpc.com ~~~~~~~~~~~~~~~~~~ "If a million people believe a foolish thing, it is still a foolish thing." - Anatole France >>Hi, >>I just purchased a pair of glasses with the Hoya 1.70 Evry lenses. [quoted text clipped - 12 lines] >I'am pretty sure that the abbe number is the same at 36. I believe that the >specific gravity is slightly lower with the 1.70, around 1.35g.cm3. Make that 1.41g.cm^3 for both. It might even be the same material just measured via European standards rather than US standards. We each use different wavelengths to determine the refractive index of the same material. Carl > Hi, > I just purchased a pair of glasses with the Hoya 1.70 Evry lenses. [quoted text clipped - 5 lines] > Thanks, > Bill |
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