Well I'll be damned.
Seems that the eye drops I've been using in one of my eyes (Latanoprost) can change your iris color, especially for hazel eyes. My eyes are (were) hazel green.
Been using the drops for several years. Just a couple months ago, some guy asked me about my 2 colored eyes, and I thought he was just blowing hot air, so I told him it was probably a shadow from my bangs.
Then, today, a woman at an appoint I was at with my husband, said something about my brown eye and (from across the room) blue eye. The picture below isn't perfect, but shows the difference.
My untreated eye on the left (which is my right eye) and the new improved eye on the right (my left eye)
Pretty cool, huh?