Eye color, Does it mean anything?

[palomo]

Hello, i have a couple of birds that have one eye completely in color black or dark and the other eye is half red and half dark, and sometimes it has more red and sometimes it has more black, it changes, then there is one that has one eye completely orange and the other half orange and half black, i just wanted to know if it means anything, you can see them in my picture album so you get a better idea of what im talking about, thanks in advance!!!