odf,

Phew! On the one hand I am very relieved to see that it is not a blunder on my part that is causing the artefacts around the cornea. On the other hand I'm very disappointed that it seems like this won't work in P6. Perhaps BB or someone else can come up with a P6 fix. Personally I know very little about render settings and shader trees, so I'll leave that side of things to the experts.