A Silly Question...

I have kind of a strange question....
What color are Rhett's eyes?? xD
I mean, in some pictures they look brown...
Like here:

But in other pictures and videos, they look blue...
I.E., Here:

(I'm sure I could have found better pictures to show this, but I think you get the idea. xD)

Is it the type of camera, or the lighting...
Or Rhett, do your eyes change color all the time?
I've seen it before, but never this drastically. x]

I know this is a silly question, and I'm sorry for wasting your time, but this was bothering me all week! xD
Thank you! ~