ml1201, your story is quite interesting. It might explain a bit in my situation. I don't have extremely bright eyes, but what you're telling is pretty much familiar. I also have no problem moving in a dark room. I remember walking in the forest and all my classmates tripped over everything haha. Also I cannot watch tv in a dark room, it hurts as much as walking from a dark room building, outside. We all know how that feels. It buuurns xD But I have that in the evening very quickly.
I also lower the brightness of my computer almost halfway while others have it full out.
My eye changes color depending on the kind of light too! I have 3 colors in them due to partial heterochromia.
But in photo's they're always blue for some reason. The heterochromia is completely gone in photo's, and I got no clue how that works. This is the most recent photo;
[x] (it's a cutout of a selfportrait I made recently)
My face is towards the shadows though, so it looks darker than reality. In the full photo you can see the light comes from the back of my head.