Would color changing eyes affect vision?

I am writing a medieval fantasy story in which there is a race of humanoids who have multicolored eyes. Their eyes may change to bring out one color or another if they are experiencing very stressful/emotional situations. These humanoids are nearly the same as regular humans, except for their eyes, and they have a strong connection towards nature.

I was wondering if this eye change would be possible and whether or not it would have any impact upon a person's ability to see.

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Would color changing eyes affect vision?

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