Quote - Good looking eyeball render, but I really don't understand why the iris geometry is shaped like a dish.

I don't understand that either, and think the it should be changed.  if you Google "eye anatomy" most images depict the iris as a fairly even convex curve.

Also the eyeball bulges out at the front. This may be true to life, but a real eyelid can easily deform to accommodate this as the eye rotates. In Poser the morphs to mimic this could be quite hard to make, and I suspect that a spherical eye might be better (with perhaps a very slight bulge of the cornea) .