The refracting cornea will block all the light reaching the iris and pupil. So you'll need to change those shaders to use ambient - to be self lit.

This requires you to decide how much to light them.

In the shader, you grab the HSV coming off the color map and plug it into Ambiet_Color. Set the Ambient_Value as you like. I used .5 here.

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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)