Ahhhhh dang it. I'm such an idiot sometimes.

In my geometry builder script, at the top, it says this:

inch = 1/103.200005
#inch = 1/100.0
inch = 1/96.0
inches = inch
foot = 12 * inch
feet = foot
centimeter = inch / 2.54
millimeter = inch / 25.4

I forgot I had left the geometry builder set to old Poser PNU = 96 inches instead of the new PNU 103.200005.  I did this because when I build real-world props like doors and windows, they just don't look right if we take Poser's definition of inch, when compared to the heights of practically every figure which were all designed around the premise that a PNU is 8 feet.

So - the result is the eye is too big by a factor of 103.2/96, resulting in a Poser-measured dimension of 28.25 mm, just as you reported.

Sorry about that.

You could just scale them to 93.203%. Or do you want me to re-build and re-post?

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)