Interesting. I don't think I've seen a picture with its big eye open. Yes, waiting to see what develops seems the only thing you can do, and any steps to protect the chick while young and getting integrated. That's what I'd do.I never started a thread there. I was there when she hatched and she came out of the egg as she is. I was hoping it was swelling but honestly at this point, it really do suspect it is a birth defect. There is no apparent redness, no signs of infection at all. Just one unusually large eye. The chick can open and close it normally and appears to even see out of it. I treated for two weeks with Terramycin but it did nothing to help or hurt. Idk what else to do but wait and see how it looks as she grows and hope another chicken or chick doesn’t peck it.