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Medical Forum / General / Vision / January 2005

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response - Plastic Lenses without AR coating + is there UV protection if you don't have AR coating

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aimee - 27 Jan 2005 09:32 GMT
thanks for your advice Mark. (I wasn't able to reply to your reply,
some error with retrieving addresses...)

I live in the Netherlands, and there is no walmart here.  could you
(or anyone else) recommend any particular brands which offer the 1.6
plastic With Anti Scratch Coating and WITHOUT AR coating?

Two things I'm especially looking for are:

Abbe value:
I've heard that getting a high abbe value can impact on one's vision.
would high abbe value be something to consider with my prescription
(-3.5 and -3.0)?

Durable anti scratch coating:
I'm aware of the Premium AR coatings which are available.  Is there a
lens brand that comes with an equivalent "Premium grade anti scratch
coating" which can withstand almost anything?  How many years could I
expect this to last, (what with the frequent cleaning with dry cloths,
landing lens down after being dropped etc?)

Thanks,
Aimee
Mark A - 27 Jan 2005 11:56 GMT
> thanks for your advice Mark. (I wasn't able to reply to your reply,
> some error with retrieving addresses...)
[quoted text clipped - 19 lines]
> Thanks,
> Aimee

Did you hit "Reply" or Reply Group". Make sure you "Reply Group".

Crizal and Alize from Essilor are fairly durable AR coatings. Alize is
fairly new and said to be easier to clean than Crizal. They are available on
most Essilor lenses and also some other brands. There are some other good AR
coatings also (check the newsgroup archives at google groups).

The higher the abbe value, the better the optical quality (less chromatic
aberration). Usually the higher the index of the lens, the lower the abbe
value. One exception is polycarbonate (1.59 index), which has the worst abbe
value (30) of just about any lens on the market. The higher the lens power
of your Rx, the more this is important. It affects some people more than
others. Your lens power is probably borderline as to whether it is
noticeable.

It is possible that labs in the Netherlands simply do not provide lenses
without AR coating, even if the manufacturers do have them without AR. I
don't know what to say, except to keep looking. See if you can find out
which lenses they have available (with AR only) and provide that information
here.
 
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