Alize coating?

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DataPacRat - 20 Jan 2005 01:07 GMT

My biannual eye check was today, so now it's time to shop for new
glasses. The local store that's been recommended to me
( http://www.vision-clinic.ca/lenses.html )
lists several different anti-scratch coatings (Trio, TD2, Crizal,
Alize), which I'm thoroughly unqualified to choose between. Might
somebody here be able to help, or at least suggest a good reference?

For reference, my new prescription is
Distance:
Sphere / Cylinder / Axis
R: -250 / -275 / 096
L: -250 / -275 / 090
. I spend most of my time either looking at a computer screen from
about two feet away, reading books, or watching a TV from 12 feet
away.

Thank you for your time,

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DataPacRat

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Mark A - 20 Jan 2005 01:28 GMT

> My biannual eye check was today, so now it's time to shop for new
> glasses. The local store that's been recommended to me
[quoted text clipped - 13 lines]
>
> Thank you for your time,

Crizal and Alize are very good and relatively durable AR (anti-reflective)
coatings from Essilor. AR coatings are highly recommended by opticians
reduce glare and to improve vision. The difference is that Alize is claimed
by Essilor to be easier to clean than Crizal. AR coatings are notorious for
being hard to clean and for being fragile (like the front of a high quality
camera lens that is coated).

Both of these are considered to be AR coatings and not really scratch
coatings (although there is a scratch coat built-in). Most good pure
scratch coatings are more durable than the best AR coating (even the most
durable AR coatings such as Crizal and Alize).

I suspect the others are also AR coatings, but the web site is a bit vague.
I would go with Alize if it is available for the lens you choose.

BTW you real Rx is as follows (the OD's often like to leave out the decimal
points):
R: -2.50 / -2.75 / 096
L: -2.50 / -2.75 / 090

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Dom - 20 Jan 2005 08:09 GMT

Crizal Alize is a combined hard/multicoat and is recommended.

Dom

> My biannual eye check was today, so now it's time to shop for new
> glasses. The local store that's been recommended to me
[quoted text clipped - 13 lines]
>
> Thank you for your time,

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Robert Martellaro - 20 Jan 2005 18:09 GMT

>My biannual eye check was today, so now it's time to shop for new
>glasses. The local store that's been recommended to me
[quoted text clipped - 13 lines]
>
>Thank you for your time,

The Trio sounds like an AR coat. The TD2 coating sounds like some type of
surface hardening (scratch resistant coating). If you choose anti-reflection
(recommended) the Alize, Zeiss Advantage (available in US in Feb.), Komodo
Extreme, and I-Coat Stainless use a new top coat over the AR stack that makes
the surface much easier to clean.

Try to use an atoric design due to the level of astigmatism. Off axis
performance is noticably improved. Optima's Resolution and Sola's Vizio are
examples of atoric design.

Hope this helps

Robert Martellaro
~~~~~~~~~~~~~~~~~~
Optician/Owner
Roberts Optical
robopt@execpc.com
~~~~~~~~~~~~~~~~~~
"Science is a way of trying not to fool yourself."
- Richard Feynman

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