Hmm. I downloaded your zip and loaded what you assembled. Works fine for me, but I'm in Poser 8. So it's not misconfigured. Perhaps this is a P6 problem.

I rendered this with PM:Rim Shadow=0, like you did.

I'm wondering about raybias. I think its meaning has changed. P6 was not very good at refraction.

I haven't seen anybody else besides you and me post any renders with the eyecover. If they did, they didn't mention it. Why is that? Do they only work for me? Or is practically nobody interested?

We need some more datapoints.

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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)