I took a different approach, its a bit heavier on the renderer I guess. But I imported the iris and implanted it into the eye rather than added as a texture. Then just made the from of the eye glass.
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An other, but very difficult path, is to render the eye and bunny in different layers. Then you can use the render outcome of the eye, as source for the rabbit render (with eye).
With this approach, you can add some modifiers to the eye rendering (like if you where working in Photoshop), before it’s used in the rabbit. Difficult to explain, but it is a difficult, but professional process.
Have fun!