Thank you! Your reply was very helpful and I've decided to go with the round lenses after all.
On Sep 16, 1:21 am, "Chuck Knight" <[EMAIL PROTECTED]> wrote: > OK, let's address your questions. We'll start with the "plastic is better" > comment. > > For high minus prescriptions, no matter WHAT index your lenses are, the > edges are going to be thick. Sorry, you're going to have coke bottles. > BUT, you can mask the visible edges by choosing a thicker frame, or even one > that is more concealing with a wider temple. The idea is not to get rid of > the edges of your lenses, but to make them less noticeable. > > Here's an example of an extreme prescription in a wire rimmed eyeglass > frame:http://www.optical4less.com/pic/Specialmaking/thickerb.jpg > > See how noticeable? Wire rimmed glasses put a definite and constant > thickness frame around the edge...and a very thin one, which makes the > lenses look thicker. If you're trying to hide that edge, you need to HIDE > it...cover it up, or in another way draw attention away from it. > > Plastic frames have a MUCH thicker edge, and so hide more of the edge than a > wire rimmed pair. Also, their designs tend to be more dramatic, and have > wider temple arms, so they camouflage the thickness a little bit better. > > The other option would be to embrace your thickness, and just minimize its > appearance with a polished edge on a rimless pair. With antireflection > coating and a relatively small lens, it might visually "disappear" into the > lines in your face. Small oval glasses tend to do just that, and blend into > the shadows in my eye socket. > > Now...thickness. There are online thickness calculators which do a good job > at estimating thickness. As thick as your lenses are going to be, > regardless of index, nothing is going to make them look thin. > > Now...round lenses. Round lenses have nothing to do with the "magnify or > shrink" look as you see through them. That's the lens...not the lens's > shape. The fact that you have wide frames that "stick out" far enough to > see at that angle makes it appear more noticeable. The round, being > significantly smaller in width, will minimize that appearance. Also, the > extra height will likely serve you well. > > Additionally, round lenses are the supposed ideal for hiding the thickness > of a lens, since it minimizes the amount of "spreading out" it has to do to > reach the other end of the frame. The further a minus prescription gets > from the center, the thicker it gets. According to that, you should be > choosing rounder lenses, and the smaller the better! Of course, > practicality must play a part too, as you discovered. > > Let's see...the rest of your questions dealt with whether you should pay for > the high index lenses. Only you can answer that question. Bottom line, > feed the values into a lens thickness calculator and see if you can live > with the results. > > http://www.opticampus.com/tools/thickness.php > > According to this estimate your stronger lens, in a 1.56, should be about > 8.1mm thick. That's assuming a lens size of 45mm, bridge of 20mm and PD of > 62...my PD. The high index, at 1.67, should result in a thickness around > 6.9mm. Both are really thick, but not as bad as I expected. > > Fill in your own information and it'll give you an even more accurate > estimate... > > Hope this helps you out! > > -- Chuck Knight > > On Mon, Sep 15, 2008 at 10:54 PM, David Hunter <[EMAIL PROTECTED]> wrote: > > > Hi all, > > > First, thanks Ira for this blog--it's been an eye-opener. > > > Now on to the good stuff. Okay, I've got a fairly high prescription; > > -11.75 in one eye and -9.75 in the other. I've primarily worn contacts > > and had an out-of-prescription pair of glasses for probably four years > > at least now. Getting glasses for this type of prescription is > > difficult online; I only found 39dollar and Zenni had prescriptions > > that would go that high. > > > I got all the measurements and prescriptions I needed, including my > > PD, from Wal-Mart. For those interested, they didn't give me any > > trouble. They even have some glasses with comparable prices (well, > > comparable to $40, not $10), but they're low on the fashion. > > > Anyway, I ordered a pair from Zenni, and they came relatively quickly, > > no fuss. The problem is that I didn't pay enough attention to the > > height of the glasses. I have a big head, and while I shopped for > > temple length, I thought 26mm height would be fine. Turns out, not so > > much. Also, the bridge wasn't long enough, either. > > > So now I'm stuck with these eyeglasses, and I might try to get a > > refund but I'll only get half back even if they approve it. I might > > keep them for a fashion pair. They were $70 after the added cost of a > > high prescription ($9) plus getting the thinnest lenses possible > > ($40). > > > Anyway though so now I'm looking for another pair, and I think I've > > found them, but they're round glasses--think John Lennon. I have some > > questions: does the thinnest lense--1.67 versus the standard 1.57 > > lense, make that much difference at my prescription? I have the thin > > 1.67 lenses with the pair I bought from Zenni and they still do that > > thing with my eyes and face where they shrink my head and eyes pretty > > bad when you're looking into the lenses. The middle of the lenses > > isn't terrible but they bow and the edges are sorta coke-bottle. But > > then again, they're short in height and that means that edges have to > > bow closer to my eyes than if I had bigger lenses. Right? > > > I'm not sure what effect round lenses have on that aspect--how they > > shrink the eyes and where they shrink them. If they shrink them all > > around then maybe I still want the thinnest lenses, but if, because of > > my prescription, it doesn't make much difference (and it didn't > > between my previous lenses, which were boxy like my current ones but > > taller in height and yet only 1.61 thin), then I can save like $40 by > > just getting the regular thickness. > > > Of course, my prescription is higher from my last set, significantly, > > so maybe they weren't that different because I was looking at thinner > > lenses but with a higher prescription. > > > I'm just wary of spending another $70 on another pair only to be > > disappointed again--or obviously more weary of adding $40 for thin > > lenses when it won't matter anyway. My eyes are a very attractive > > feature on me but contacts are starting to get more uncomfortable and > > my eyes are more easily irritated by them than they used to be, so I'd > > like to wear these to work every day. > > > I'm sorry, I gave a lot of details there and if I confused anyone I > > can clarify. I'm just feeling a bit stupid because I bought a lemon > > pair (I was getting a bit of a headache because every time I looked > > down I was looking through my natural eyes and not my lenses and the > > switching was bothering me), and anyway it was my fault for not > > considering the height of the lenses. Still, though, even if I buy a > > new pair for $70 I'll be right around what I'd spend in the store, and > > much less $$ for a fashionable pair of glasses. > > > Thanks, > > > David > > > PS--In addition, I was told by a clerk in the Wal-Mart Vision Center > > that if I wanted to lessen that bowing effect for lenses, I can't get > > rimless or half-rim because they bow more, and even that plastic > > frames are better than metal frames. Of course I wonder how much > > better, if it's even true. I really don't want plastic frames but the > > round glasses I'm considering do have pretty thin metal rings to hold > > the lenses. Here's a link to what I'm considering: > > >http://zennioptical.com/cart/product.php?productid=764&cat=22&page=2 > > > and here's a link to what I bought from Zenni: > > >http://zennioptical.com/cart/product.php?productid=1078&cat=22&page=2 > > > and I like these below but the half-rim worries me and the bridge is > > kind of small--although does anyone know if it matters whether the > > bridge is just a plastic rim around the nose of the glasses or if > > they're those attached pieces of plastic for the nose that most > > glasses have? > > >http://zennioptical.com/cart/product.php?productid=832&cat=21&page=2 > > > Sorry again for appearing so demanding in my questions; feel free to > > tell me to mess off in the face of asking so much advice for free. :) > > If it helps, I've taken a pay cut in life to work for a nonprofit the > > benefits the mentally and physically handicapped. So helping me helps > > them. :) Okay, not really. 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