That's the strange thing - using the material picker all over the eye will select the cornea material each time, but when I edit it, there is no change in the render.
Using the deep channel kernel and wireframe rendering reveals that the cornea material is not there for Octane. The iris and the pupil is exposed. If I do a wireframe preview in Poser, the whole eye is covered by the cornea, as it should be.
Still, the material picker will select the cornea, also as it should be. But the cornea doesn't render, even if I turn it into a black diffuse material. I can still see the underlying geometry in the render then.
I'm so confused.