Black eyes fade to blue?

Oct 7, 2011
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What causes eye colors to fade/change in humans? I was born with completely black eyes, you could not tell the iris from the pupil but every year they get lighter and lighter. Now that I am 18 my eyes are completely gold and orange when you shine light on them. My father had black eyes when he was a child but now in his 40's they are a mixture of blue green brown and yellow. What causes Eyes to do this?
 
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