Purevision vs. Focus Night & Day?

I posted the following a couple days ago, but I don't see it in my
newsreader, so I think it may not have actually posted. Therefore, I'll
repost it. If you see it twice, sorry.

----------------------------------------

Now that Purevision is available once more in the USA, one wonders how these
two 30 day-approved silicon hydrogel lenses compare. I think it would be
interesting to hear from eye doctors who have prescribed both, and from
patients who have tried both, to hear how they compare.

Not along the lines of "which is better", because I'm sure the answer to
that one would be "depends on the patient". One might be better for some
patients, the other for other patients, etc.

However, it could be discussed which might be better for certain conditions.
For instance, for patients with dry eyes, which of the two seems to give
better results? For patients with astigmatism?

Also, both are aspheric, which I understand means they provide a little
presbyopic correction, even without being multifocal, and even if not
prescribed with monovision. (I'm currently wearing N&D monovision.) Does one
of these two provide better inherent (not considering monovision) presbyopic
correction than the other? Anyone know if either company plans to come out
with a multifocal silicone hydrogel in the near future?

Also--has one of these two lens materials demonstrated more or less problems
than the other in extended wear usage?

I see the Purevision has some kind of marking so you know for sure that the
lens is being put on the right way, not inverted. That is an advantage over
the N&D, although minor. Any other features that are better in one than the
other? It would be interesting to see all aspects compared . (Once again,
not to say "which one is better", but to see which might be more suitable
for different patients and conditions.)

Thank you for your input.




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