Why do my eyes change color based on my emotion?

I have blue eyes, but they don t stay the same shade. When I m sad and crying, really happy/laughing or am really mad and showing it it makes them very bright. Being sad or angry without showing it or I am really bored they are a very dull gray. Then when I don t have any particular emotion they are either plain... show more I have blue eyes, but they don t stay the same shade. When I m sad and crying, really happy/laughing or am really mad and showing it it makes them very bright. Being sad or angry without showing it or I am really bored they are a very dull gray. Then when I don t have any particular emotion they are either plain blue or dark blue near the edges and light in the middle. I ve asked my friends with different colored eyes but they say it doesn t happen with them.
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