you're eyes can change due to other things than lighting. (i know from experience) people who have more than one color in their eyes genetically can have different color eyes at different times, depending on what they're wearing and if they wear makeup. for example, i got bored one time so after i had taken out my contacts, i stared up at the ceiling light for a few seconds, then looked at my eyes in the mirror. (the point of staring at the light was to get my pupils to retract so i'd be able to see more of my iris) and i found out that i naturally have 3 different colors in my eyes. dark green, sandy brown, and brown. so my eyes are usually either brown or green. (lately they've been green more often, though) so genetically your eyes can change color, in a manner of speaking. you just see a color that was hidden before.