Re: Most durable AR coating for eyeglasses?

"SQ" <onestatusquo@xxxxxxxxx> wrote in message
news:ac7d4663-02bd-4a04-b475-ff33e8198a75@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
My insurance can cover some of the cost of these lenses, but they are
still expensive.

I hear that Crizale Alize adds hydrophobic coating on top of the AR
coating, making it
slick and even easier to clean. Browsing the optiboard.com forum, it
looks like there is no clear consensus on what's the best AR coating.

Let me ask, does the glass (i.e. plastic) itself make any difference
clarity-wise? With regards to the Abbe value? I have 1.64 "high
index" now.

Most of the modern high end AR coating I mentioned (including the Zeiss
Carat Advantage) have a similar "easy to clean" surface. Early AR coatings
were very difficult to clean without leaving streaks (if you have an old
camera lens with AR coating you can attest to that).

Abbe value makes a big difference in the quality of lens (clarity is
probably not the best term for it, but it is not wrong either). I have never
heard of a 1.64 index lens (but not saying it does not exist). The common
lens indexes are below:

1.50 regular plastic
1.53 Trivex
1.59 polycarb (avoid this like the plague - lowest abbe value of any
commonly dispensed lens material)
1.60
1.66 or 1.67 (depends on lens manufacturer - some are 1.66 and some 1.67)
1.70
1.74

Normally, the higher the index, the lower the abbe value. The higher the
abbe value, the less chromatic aberration. The one exception is polycarb,
which has the lowest abbe value of any commonly dispensed lens. Abbe value
is more of an issue if you have a moderate to strong lens power. You may not
notice any difference between abbe values in a low power lens (plus or
minus).

Most lenses are polycarb (terrible optics, but high tensile strength and
high impact resistance) or 1.66/1.67. 1.60 is a good choice if you lenses
will not be too thick for you. Trivex is a good replacement for polycarb
were safety lenses are needed.

For the best advice on lens material, please post you exact Rx here. Also,
it would be good to get the exact manufacturer and lens design your optician
is suggesting for you (in addition to the lens material). Often times they
will not like to tell you (and some are so ignorant they don't even know),
but if they don't tell you, tell them you will take your business elsewhere.


.

Relevant Pages

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  • Re: Do I need to use lens hood for indoor theater shots?
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