Good comment Mr Barkel. I attended a genetics seminar and what i remember of the genetic traits of eyes is that you can tell who the father is not in some cases as you state. There are colours that are dominant over others and there are recessive traits etc it is a study in itself. Two eyes of a certain colour cannot breed an eye of another colour but dont ask me to quote which is which as I cannot remember and would not like to claim knowledge without firm foundations
I had a look at the birds on your website and I think there are some magnificent specimens and some top quality eyes on them.
All the best,
Paul.