One of my 7 mth old hens is keeping one of her eyes closed. It's not swollen and she will open it when I pick her up or she is running. I do not hear any gurgling or respiratory distress sounds. This happened once before about 2 months ago and I put saline drops and terramycin ointment in it plus treated with tylan50 injections for 5 days as she was having respiratory issues then too and she made a full recovery. I'm hoping to hear from some people about what they think is going on. Is it possible she has a respiratory infection again and I'm just not hearing it. Should I treat as before and possibly treat the rest of her breeding buddies? It's a total of 5 chickens. They range in age from 7 to 7 1/2 mths. Thanks for all your words of wisdom.