not brown, this kind of eyes happen because of
melanin. if you have concentrations of melanin in eyes they will turn brown. If you lack a little less of melanin they will
turn green or hazel. And if you miss melanin real time they will appear blue. The same reason why babies have blue eyes, because melanin haven’t don it’s thing yet. That’s why with some people while aging melanin will get bigger and eyes will turn darker and opposite :)