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This question already has an answer here:

Why is this Iris not showing? It worked previously, before I started working on the fur and particle system today and other parts of the model (a monkey model) and at the end I realised that the Iris disappeared. I haven't touched the eyeball, but now the iris doesn't show. I suspect that it has to do with the UVs, but everything is in place, I didn't tweak anything, it should work. I'm attaching a stripped down .blend (only the eyeball) and a screenshot. Can someone have a look into the file, and try to make the iris show?

I should also note, that when I open the previous file, it shows. But when I append that eyeball to the new file, it doesn't show.

Eyeball

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marked as duplicate by cegaton, Community Nov 6 '16 at 16:06

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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You are using a glass shader for the cornea. Unfortunately that shader does not behave as expected when it comes to letting light through it...

You need to add some transparency to it in a node setup like this:

enter image description here

For a more detailed explanation read: How to illuminate the darkness inside glass objects in Cycles?

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