Thanks for posting this link. I'm going to use this a lot. On May 4, 9:28 pm, Chuck Knight <[email protected]> wrote: > Your sphere isn't particularly strong...your astigmatism isn't too bad. All > in all, a very "ordinary" prescription, judging by what we deal with on this > list. > > So, let's deal with your other question...lens thickness. Index is a term > referring to the refractive index of the lens material...higher numbers make > for thinner lenses. The difference is most noticeable in thick/strong > lenses. BUT, the difference on a relatively normal prescription isn't that > enormous. Usually it's a difference of around 10-20%. On a lens that's an > inch thick, it's enormously noticeable... Yours aren't that strong. > > There's a lens thickness calculator that we usually refer people to, so they > can see the differences in their *own* prescription, themselves. Let me > find that URL in the list > archives...http://www.opticampus.com/tools/thickness.php > > Also, be aware that most of the online places use "medium index" lens > materials, like polycarbonate, by default...it's not considered an upgrade, > where we shop. > > So, shop around. At these online prices, you can *have some fun* with your > frames. Some of the places sell them for $7 or $8 a pair! Historically, I > always chose modest wire rimmed frames, until I finally chose some bold > plastic ones. Why? because I'd never had plastic, before. > > Turns out, that they look good on me! I've never received so many > compliments on any other "accessory." > > -- Chuck Knight > > P.S. BE SURE to get an accurate PD measurement. It's the key to success > with online glasses, and the one part of the prescription that your doctor > *may* give you trouble with. We've many discussions about this, and even a > few sample "scripts" of how to handle a difficult doctor, or where else to > go to get it measured. > > > > On Mon, May 4, 2009 at 12:13 PM, PghGuy <[email protected]> wrote: > > > I'm doing research for purchasing glasses online. I last got glasses > > eight years ago (I know, too long) and am only now becoming familiar > > with the options for lenses and frames that are available. I also > > don't know how much this prescription differs from my last one since I > > went to a different optometrist and don't have the last prescription > > with me. Given my prescription, would lens upgrades such as > > polycarbonate or high index be a good idea to reduce the thickness or > > would it be okay to go with the lowest plastic offered? At the moment > > I have polycarbonate lenses and they are adequately thin. I read that > > high index is recommended for a prescription of -5.00 or higher but > > mine isn't quite that high. I'll be getting metal frames with lenses > > perhaps 46-48mm in width and probably under 38mm in height. > > > OD--Sphere: -3.50; Cylinder: -0.75; Axis: 136 > > OS--Sphere: -3.00: Cylinder: -1.25; Axis: 074 > > > Would you consider this a "strong" or "abnormal" prescription in any > > way? > > > Any advice would be appreciated. Thanks a lot!- Hide quoted text - > > - Show quoted text -
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