@KymJ:

No, I have not centralized links for my postings. They are all over the place. Maybe I'll start assembling them in a google page.

However, I post a lot at RDNA the node cult. Lots of goodies there, some really complex, some simple. Unfortunately, that forum has started moving older stuff into "archives" and doesn't show that content unless you use the search engine. And ... the search engine sucks. Yet another reason I should make a list of links somewhere that is preserved.

One particularly good Node Cult thread to read about reflection and refraction is here:

The Fresnel Effect - Glass, Paint, Plastic, and Metal 

The technique I show for glass will work perfectly for cornea. The technique I show for clear-coat paint will work perfectly for eye white, although for that part you should add a bit of turbulence to the bump channel. You'd also apply the same shader to the lacrimal.

As for reflection maps, that's no problem. Use them instead of, or in addition to, the Reflect node. Just be sure you plug the reflection image into a Sphere_Map node first. If you plug it straight into the Reflection channel or Reflection node, it will not map correctly.

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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)