> In message <eqifj.33362$JD.687[at]newssvr21.news.prodigy.net> at 04:16:10 on Fri, 4 Jan 2008, "William Stacy, O.D." <wstacy[at]obase.net> wrote
> > You've pretty much answered your own question, in admitting the thick
> > lens is the wider one (as always), but for verification, click on:
> > > http://www.opticampus.com/tools/thickness.php
> > Neat tool - thank you. For lens size, do you measure diagonally at the
> longest point, or across at the longest point?
> Actually when comparing these there is very little difference in size -
> maybe a couple of mm. Because the top edge of the lens is wider than
> the bottom edge in both pair, one pair looked bigger than the other when
> I held one above the other
> For some reason my last pair from them seem to be thinner than the tool
> predicts and I didn't pay extra for thin lenses (I still have my email
> to them to prove it)

> Are you saying the same prescription lenses can be different thicknesses
> on the same index but made with different plastics?

> If I post pictures would someone be happy to give an opinion

> "Franci via MedKB.com" <u36039[at]uwe> wrote in message
> news:7db7ed6e5a23e[at]uwe...
> > My last prescription is -2.75 and i wasn't advised to go for a thinner
> > material.
> > I'm surprised how much the lenses protrude from the metal frames so I'd
> > advise high index at this level.
> > Is this general practice or does it show me to be "fussy"?
> The term "high index" has no real meaning anymore since there are so many
> different indexes available now. At one time the most common material was
> 1.50 index and 1.60 or polycarb (1.59) were considered high index, but now
> 1.67 is quite common (and sometime the only index available in certain
> models), and there are even higher indexes available.
> So unless you know exactly what index lens you had to begin with,
> speculating about whether a different (unspecified) index lens will make it
> any thinner is like a dog chasing its tail.
Are you saying the same prescription lenses can be different thicknesses

> My last prescription is -2.75 and i wasn't advised to go for a thinner
> material.
> I'm surprised how much the lenses protrude from the metal frames so I'd
> advise high index at this level.
> Is this general practice or does it show me to be "fussy"?

> Neat tool - thank you. For lens size, do you measure diagonally at the
> longest point, or across at the longest point?
> Actually when comparing these there is very little difference in size -
> maybe a couple of mm. Because the top edge of the lens is wider than the
> bottom edge in both pair, one pair looked bigger than the other when I
> held one above the other
> For some reason my last pair from them seem to be thinner than the tool
> predicts and I didn't pay extra for thin lenses (I still have my email to
> them to prove it)
> --
> Mike News

> You've pretty much answered your own question, in admitting the thick
> lens is the wider one (as always), but for verification, click on:
> http://www.opticampus.com/tools/thickness.php
Neat tool - thank you. For lens size, do you measure diagonally at the

> Are there any tools online for giving a rough idea how thick glasses
> lenses will be at their thickest point given the prescription, size of
> lens and lens type? I've ordered some 1.67 thinnest lenses online and
> these are much thicker a pair from an almost identical prescription with
> normal 1.57 thickness I ordered from the same place a year ago (as they
> were just meant to be temporary!). I do admit the lenses in my latest
> pair are widerr, but at the point where the others would have stopped
> (from the middle out) they are about the same.
> I've always gone for high index and am used to what size they roughly
> end out at, but to me these don't look right. This was as part of an
> order of 2 pairs (along with a reading pair with a +1.00 Add) and they
> are insisting the distance pair are correct from the one email they've
> responded to. Now they seem to be refusing to answer my emails!

> Are there any tools online for giving a rough idea how thick glasses
> lenses will be at their thickest point given the prescription, size of
> lens and lens type? I've ordered some 1.67 thinnest lenses online and
> these are much thicker a pair from an almost identical prescription with
> normal 1.57 thickness I ordered from the same place a year ago (as they
> were just meant to be temporary!). I do admit the lenses in my latest
> pair are widerr, but at the point where the others would have stopped
> (from the middle out) they are about the same.
> I've always gone for high index and am used to what size they roughly end
> out at, but to me these don't look right. This was as part of an order of
> 2 pairs (along with a reading pair with a +1.00 Add) and they are
> insisting the distance pair are correct from the one email they've
> responded to. Now they seem to be refusing to answer my emails!
> --
> Mike News