Re: polycarb vs 1.67 for weak prescription

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Re: polycarb vs 1.67 for weak prescription

Mark A

23 Jun 2006 08:28

> Ok, Doc is really advising against CR-30 and recommends
> polycarb, or as an alternative 1.67, 'cause I'm getting drill
[quoted text clipped - 24 lines]
>
> -Quick

Polycarb has the worst chromatic aberration of any commercially available
lens material (measured by abbe value) regardless of index. Avoid it like
the plague.

Except for polycarb, the higher the index, the worse the chromatic
aberration. 1.67 is overkill for you. I would go with 1.60 at the most.

Quick

23 Jun 2006 05:28

Ok, Doc is really advising against CR-30 and recommends
polycarb, or as an alternative 1.67, 'cause I'm getting drill
mounts. Air Titanium rimless.

O.D. +1.25 sph add +2.25
O.S. +0.75 -0.25 add +2.25

Physio 360
Crizal Alize with Clear Guard (gold)
Transitions (grey)

Yea, I know, I don't need the 360... it's only $20 more.
I don't play Jai Lai

So...
I don't expect the difference in thinness to be measurable.
I don't expect the difference in weight to be noticeable.

Is there any possibility I could see any material caused
abberations with either (I'm very sensitive to that sort of
thing)?
Would there be any difference with the transitions
performance?

Price difference is about 10% of total so not a factor
if there is any advantage to the 1.67

-Quick

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