I have about a 10 week old chick that was with one of my hens. Last week I noticed its eye looked red/runny. Then I noticed it was not opening its eyes at all. It doesn't seem to have any other symptoms - no runny nose, coughing, or sneezing. I separated it and have been treating the eyes with Teramycin 2-3 times a day for almost 5 days now, but I have not seen any improvement. The chick still won't open its eyes. It is eating and drinking a bit, but seems lethargic. I don't know what to do. It seems uncomfortable, and I don't want it to suffer. I just have no idea where to go from here. Pics below. Any advice would be greatly appreciated.

