I have worn the Cibavision Focus Night & Day lenses for several years, and
found them quite comfortable.

Recently at the OD though, he gave me a sample of "AirOptix Night and Day",
by the same company.

Is there any difference between Focus N&D and AO N&D, or is it just a new
name? It looks like they both use the same material (I think lotrafilcon A),
the highest DK soft contact material there is. (Different than the material
in the regular (not N&D) Airoptix lenses, which is lotrafilcon B, I think,
not nearly as high a dK.)

Is there any change in how the new (AO) N&Ds are cut? Can one still buy the
old (Focus) N&Ds, or have they been completely discontinued?

The strange thing is--I find the new AO N&D to be much less comfortable.
What could cause that?

My old Focus N&Ds had a BC of 8.4, and I notice the new one is 8.6. Could
that cause decreased comfort? Does the new AO N&Ds still come available in
8.4 BC?

Thank you.