I have a Salmon Favorelle Hen who is around 5 years old who is having issues with the frothy bubbles in her eyes.. not sure what is going on with her.. she had this condition a while back during a really hot part of our summer here in NE Ohio and I noticed that she was just not acting right so I gave her 2 days of sulmet water treatment and some oral dosing of Poultry Vet Rx on her beak and in her mouth and she responded fast.. and was back to her normal self.. then I noticed again the other day that she is back to having that frothy bubble stuff in her eyes.. and they are really watery.. i gave her same treatment to no avail this time.. however the only symptom she has is the frothy eyes. she is otherwise acting normal.. running around and such..eating etc... she has been exposed to many of my other flock an dall are together and noone else has this condition nor has had it at all during her times.. could it be any type of allergy or something that is not infectious.. I have closed flock and only exposure is to whatever would be in the general woods where I live.. no other chickens around my area nor do I have exposure and rest of flock is fine.. actually she is fine too just the frothy eyes.. perplexed!?!?!?!?