Hello, it might be completely off but where was the bird found? Was it in a very cold or hot place? It looks like skin damage that can be caused by frost, heat or even chemical burns. Skin is peeling off, fluid under the skin, eye looks like it is severely damaged. I don't know if the vet can check for damage of corneas? All vets usually have that yellow solution they put in the eye to stain it and see if there is some damage. If there is huge abrasions on the cornea the poor baby might have suffered some chemical splashing it, or depending on where it was found maybe it was frozen or burned.