Weird feathers growing in front of eye - is there an infection? Cause of this?

[CoriM]

I adopted a couple of female call ducks in March, one with wry neck and the owner said she didn't know if that issue was due to an injury or toxic feed. Her neck is practically normal now and her condition greatly improved, but her one eye has always been weird and I don't know if it was due to an injury, or what. I used Terramycin a few times but didn't notice a big difference. I'm not sure if I should give it a try again and be more consistent. I don't understand why the feathers are growing up in front of the eye, or what I could possibly do about that. She doesn't seem bothered by it, but the eye clearly doesn't look great to me and I would like to help if there's anything I could do. If anyone has any feedback or experience with something similar I would love to get some advice. Thanks in advance.