They change depending on freshness I guess, in morning the brown bit almost disappears and is replaced by the outer colour and the outer region is replaced by a more greener shade...maybe i'll take a pic in morning to see the difference (haven't seen my eye photographically this way before)
Hmm... my eye appears to have the largest pupil by far in this thread. I wasn't high when I took the photo - promise!
An optician asked me if I was on anything and laughed and then was like 'no, err, seriously, are you sure you're not on anything'. Apparently my pupils are too big for me to ever have laser surgery