Mine are dark brown, so fairly hard to mistake. Do you have light-colored eyes, by any chance? A former friend had eyes that were blue sometimes and green others, so it was hard to say what color eyes she really had. Also, for a long time I thought my T had green eyes, then realized that they're actually blue. And my daughter (and mother) have hazel eyes, where part is brown, part is green. But I think there's also a hazel eye type where it sometimes looks green, sometimes brown. So maybe one of those applies?