answer:I found this that might relate: “Certain emotions can change both the pupil size and the iris color. That’s why some people say their eyes change colors when they’re angry or loving. Eye color also can change with age. This happens in 10 to 15 percent of the Caucasian population (people who generally have lighter eye colors). For instance, my once very brown eyes are now hazel, a combination of brown and green. However, some hazel eyes actually get darker with age. Note that if your adult eye color changes pretty dramatically, or if one eye changes from brown to green or blue to brown (called heterochromia), it’s important to see your eye doctor. Eye color changes can be a warning sign of certain diseases, such as Fuch’s heterochromic iridocyclitis, Horner’s syndrome or pigmentary glaucoma.” from Burt Dubow, OD You don’t indicate what kind of changes that you are experiencing but this should give you a starting point to do further research.