What causes eye color to change?

my eyes use to be this deep deep blue and over the past 2 years my eyes have become this very very very light blue. how does this happen? what cause this to occur?What causes eye color to change?
';OK, all. Eye color can change over time because of age or, unfortunately, disease.





Eye disease is a cause of color change. So, ask a doctor to examine your eyes if you notice a slow loss of color. The change could be due to Fuch鈥檚 heterochromic iridocyclitis, Horner鈥檚 Syndrome, and pigmentary glaucoma, says Brian DeBroff, ophthalmology professor at Yale University.





Aging, however, is the usual cause of color change over time. So, yes, Emily. Color can change as we age. It does so for 10 to 15% of the normal Caucasian population. These people鈥檚 eyes change slowly over many years after they reach adolescence.





Investigators considered Caucasians (non-East Asian, non-Native American, non-African) because only Caucasians commonly have lighter eyes.





';Some eyes become darker, but most become lighter with increasing age,'; says Richard A. Sturm, a Principal Research Fellow at the Institute for Molecular Bioscience at the University of Queensland in Brisbane, Australia.





And yes, Bryan, hazel eyes do change color. Hazel eyes, as well as any lighter eyes, usually darken with age. Hazel eyes are light brown or yellowish brown.';


http://www.wonderquest.com/eye-color-age鈥?/a>What causes eye color to change?
my little cousin has a kinda of split personality. when her personality changes so does her eyes colour. then go from brown to green...quite scary lol