I've never heard about odd-eyed being from chimera, and personally I don't think that is the case. No one knows for sure what causes it, but this discussion gives some interesting insights;
https://groups.yahoo.com/neo/groups/hamstersinfocus/conversations/topics/2573 (from the Yahoo group "Hamsters in focus"). You may have to be logged in to read the thread. Make sure to read all 11 replys
I find the theories about there being a modifier or polygenic inheritance at play intriguing
