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"Changes of state are relayed from the thalamus and hypothalamus through the ophthalmic branch of the trigeminal ganglion to the motoneurons of the iris muscle structure. Changes in the impulses...

I have the same questions. I've been trying to do research. I have a gold ring in my blue eyes too... and my sister who is 23 is experiencing a change in eye color. Her eyes have always been a solid...