SaintFox - I already took into account the cross-eyed problem. I adjusted the "point-at" direction for each eye so that they do not cross. Look at my render above - the eyes are "pointing" at the prop only 32 inches away, yet they do not appear to be crossed.

The word "subtended" is not easy for non-English speakers. It means given an arc, or curve, that forms part of a circle, what is the angle, or fraction of the complete circle, occupied by something. For example, the moon subtends an angle of 1/2 degree in the sky. If you were to place many images of the moon side by side around the sky, after 720 of these, you come back to the first moon, so the moon subtends an angle of 360 degrees per 720 moons, so 1/2 degree per moon.

I am asking what is the angle subtended by the iris, so that I can make it correctly proportioned to the eye itself.

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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)