Or AIDS.or HepatitisThere's actually two different explanantions for it.
About 15-20% experience a change of eye colour just before or during puberty, this is because some of the genes that 'decide' your eye colour react with some of the sexual hormones released in your body.
When you experience an eye colour change as an adult, it'll often be less drastic ( as you noticed yourself), the reason for this is, is that your genes are now responding to elements in your environment. (illness, pressure etc... )
It also has a lot to do with protein intake, and what type of protein your body is producing. As JP said, it's the way the pigment reacts, and pigment, in essence is just a type of protein.
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