Re: AirOptix for Astigmatism?

Thank you for all the information (below), Dr. Leukoma. I didn't know if any
of the eye docs who used to write here, freely sharing info with all who
asked, still wrote here any more, with the NG having been so overtaken by
spam and Batesers. (Are there no spam filters for Usenet, as there are for
e-mail?) Unfortunately, it seems the direction that all unmoderated NGs has
gone in recent years, is down.

A few questions about what you wrote---

Interesting that since the first si-hy lens came out, N&D, several years ago
now, no other lens has overtaken, or even matched it, in dk/t. (Correct me
if I'm wrong about that.) I know you wrote that as far as comfort is
concerned, higher dk/t is not necessarily more comfortable. But how about
for eye health? Wouldn't the more oxygen permeability=better for the eyes?
I'm surprised that the manufacturers (including Ciba) have not tried to
create lenses with higher dk/t than N&D. (Or perhaps they did try, but so
far have failed?)

Also, since N&D and Purevision came out, several years ago, have there been
no other lenses approved for 30 day wear? I'm surprised at that as well.
Since you write that AirOptix has higher dk/t than Purevision, and PV has
been approved for 30 day wear, wouldn't it make sense for AO also to be a 30
day lens? Or, do the lens manufacturers just now want to deal with the
testing process any more, that they have to go through, to get lenses
approved for 30 day wear?

(As mentioned, although wearing N&D and Purevision, I usually take out my
lenses once per week, clean them, leave them out overnight. So, I guess 6 or
7 day lenses should be fine for me. But, if I hear a lens has been approved
for 30 day wear, I figure that that lens is probably healthier to sleep in
at all, than a lens approved for 7 days. So, I'm surprised if no
manufacturers try to get that 30 day approval any more.)

So--are you saying that the lenses which are supposed to be better for dry
eyes, even with the word "Aqua" in them, which one would think have a
higher water content, actually have a lower water content--like Oasys, Air
Optix Aqua, etc.? Do those lenses have a lower water content than N&D?

What about Biofinity? I remember positive comments about that lens here,
when it was first coming out, about a year ago. How does that compare to the
others?

So, of the si-hy toric lenses, do the Air Optix for Astigmatism lenses have
the highest dk/t? How do the Oasys torics compare in that regard?

How about multi-focal si-hys? Are the Purevision the only one out there
still? That's surprising to me too. With the increased aging of the baby
boomers, increased presbyopia, a lot of people wanting to look younger, not
wear reading glasses, etc., one would think that there would be a lot of
research and development into multi-focal designs. Is that not happening?

Once again, thanks a lot for the info. :-)


"Dr. Leukoma" <drg@xxxxxxxxxxx> wrote in message
news:70e0fbbf-8185-4968-81b1-eca00e41493c@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

The Air Optix for astigmatism is in the oxygen permeability range of
the O2Optix, i.e. slightly more than the Purevision and slightly less
than the N&D. I have been fitting the lens for about 2 months, now,
and am quite happy with the results. Rotational stability is very
good, which is very critical to toric lens success. In addition, the
new Ciba family of lenses incorporates wetting polymers. Comfort-
wise, I like the new Air Optix Aqua as much or more than anything else
I have tried on my own eyes.

IMHO, the edge design of the lens is far more significant in
determining lens comfort than the DK of the material. The water
content is important for dry eye symptoms, i.e. low water better than
high water, which is why the silicone hydrogel lenses perform so well
with dry eyes.

I don't want to forget the new Acuvue Oasys for Astigmatism, which is
the same design as the Acuvue Advance for Astigmatism, but with the
lower water, higher silicone content Oasys material. IMHO, this lens
is the benchmark for rotational stability in a soft lens toric.

Nice to see so many new offerings in the universe of soft lenses. How
about RGP lenses?


.

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