Eye Color

HI EVERYONE! Okay…a few days ago I was talking with one of my friends and the subject turned to eye color. Well she said that her eye color changed everyday. One day they would be brown then hazel then green. Well I never really noticed her eyes changing colors. My eyes on the other hand change hues. My eyes are blue, but somedays they are pale gray then other days they are deep sapphire. I notice they get really bright blue when I’m happy or when something festive is happening and they are also blue when I put in my contacts (but they have a blue-ish tint to them so I can find them if they get dropped so that explains that) Antways, back to my question. Can your eyes really change colors? If not, then can they change hues of the same color? Has there ever been any recorded proof of this phenomena happen?

                 ~Danke
                   alter_ego