Glass vs Plastic

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Gary - 11 Aug 2005 23:49 GMT

Glass is definitely heavier but is it better, optically.

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Robert Martellaro - 15 Aug 2005 23:23 GMT

>Glass is definitely heavier but is it better, optically.

Gary,

You will see equally well through cr39 plastic or crown glass.

Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
robopt@execpc.com
~~~~~~~~~~~~~~~~~~
"An expert is a person who has made all the mistakes that can be made in a very narrow field."
- Niels Bohr

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plew@csus_abcdefg.edu - 16 Aug 2005 02:56 GMT

>>Glass is definitely heavier but is it better, optically.
>
[quoted text clipped - 4 lines]
> Robert Martellaro
> ~~~~~~~~~~~~~~~~~~

So, for the same prescription, would plastic or glass be thinner
or would both types of lenses have the same thickness?

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Robert Martellaro - 16 Aug 2005 17:46 GMT

>>>Glass is definitely heavier but is it better, optically.
>>
[quoted text clipped - 7 lines]
>So, for the same prescription, would plastic or glass be thinner
>or would both types of lenses have the same thickness?

Glass would be thinner due to its higher index of refraction. The difference
would be about 5%, assuming identical minimum thickness and spherical design.

Hope this helps,

Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
robopt@execpc.com
~~~~~~~~~~~~~~~~~~
"An expert is a person who has made all the mistakes that can be made in a very narrow field."
- Niels Bohr

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plew@csus_abcdefg.edu - 17 Aug 2005 02:51 GMT

>>>>Glass is definitely heavier but is it better, optically.
>>>
[quoted text clipped - 19 lines]
> robopt@execpc.com
> ~~~~~~~~~~~~~~~~~~

Yes! I would try to opt for glass after cataract surgery whenever
the OD sets it up. I am highly myopic now so the weight of glass
wouldn't be a problem if the prescription becomes quite "small".

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