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The only change in the model itself I can think of that MAY have an effect is if the sclera slightly overlaps the cornea, close to what we have for the standard eye.

Okay, well if you'd like me to make some alterations to it, or even make a whole new sclera, or even some kind of "strip"of polygons to fake that, let me know what you need and I'll be happy to do it. :-)