Oh, please. A -3.00 prescription is hardly severe...
What are the dimensions of your lenses? If you know that, you can
calculate the edge thickness, using an online calculator.
http://www.opticampus.com/tools/thickness.php
This link is to an online interactive calculator that will let you
play with the numbers, sizes, lens indices, etc. That should give you
a good idea of the thickness, and the difference that a high-index
option will make. (hint: it won't be much difference, at such a mild
correction)
Whether to spring for the thinner lenses is, ultimately, your
decision...but having the right tools makes an informed decision much
easier.
-- Chuck Knight
P.S. It's not a matter of "grades," but of refractive index. Plastic
(CR39) is an excellent lens material, but needs to be thicker for the
same correction. 1.5 index. Polycarbonate won't be *quite* as good
an optical material, but can be thinner, is cheap to produce, and is
shatter resistant. 1.56 index. High index plastics like Trivex have
various properties...some are excellent lens materials, too. But,
with disproportionately higher prices, and *other* tradeoffs.
Like anything else, it's a choice. Make it an informed choice.
On Sat, Jun 20, 2009 at 8:29 PM, Chez<[email protected]> wrote:
>
> I know that they're all different materials, that plastic's supposed
> to be a low-grade lens, polycarbonate a mid-grade, and Seiko a high-
> grade. But I don't know what lens I actually need.
>
> I scored a vintage pair of Ray Ban Wayfarers uber cheap last month but
> still haven't been able to get them fitted with lenses so I can wear
> them as eyeglasses. I took them to Walmart today and spent about 20
> minutes talking to who I think was an optometrist. She told me the
> lenses would be very thick. That I'd be disappointed when I got them.
> I asked her how thick and why they'd be thicker than what I have now.
> And she said because the frame is heavier, thicker and bigger than
> what I have now the lenses would also be much thicker. That these
> glasses would also feel very heavy once the lenses were put in. She
> said if I got them Seiko would be the best option but that at $160, if
> it was out of my budget she'd suggest just wearing them as sunglasses
> with contacts in. She seemed really genuine. Which is why I opted not
> to get the cheapest lenses and to have a look round online instead.
> And I discovered I could get polycarbonate or Seiko lenses fitted at a
> fraction of the price online.
>
> Could anyone please advise me of what lenses would best suit my
> prescription and frames.
>
> Right Sphere: -3.00
> Left Sphere: -3.50
> Right Cylinder: DS
> Left Cylinder: -1.25
> Left Axis: 178
>
> If I get polycarbonate put in the Wayfarers will the lenses be very
> thick? Does this thickness actually matter (appearance, weight, et
> cetera)? Would Seiko lenses be a better option (are there any
> downsides)?
>
> And if I'm buying lenses online can I go back to the optometrist who
> gave me a new prescription last month and request my pupillary
> distance? Will I have to pay to get the PD?
>
> Any and all help would be extremely appreciated!
>
> Thanks,
> Chez
>
> >
>
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