Can eye color change?

Can eye color change suddenly after many years being one color? I know eyes have color based on light reflecting off of the amount of melanin pigment present in the iris more than them just being a color. I guess the question boils down to can the amount of melanin pigment in the iris suddenly decrease or increase causing the eye color to change suddenly after years.
Yes
No
I'm not a doctor (optometrist)
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Can eye color change?
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