I have 2 rooster that have watery eyes (both eyes) - but no other symptoms. One has very slightly swollen eye on one side - but you can hardly notice it. The 'tears' often run down their faces and it looks like they are crying. The first one to get it I treated with vitamin B12 in the water for a week. The following week I treated with antibiotic in the food and water and an injection from the vet. This week they are getting apple cider vinegar in the water. There has been NO change in the eyes in nearly one month - no better and no worse. They have no other signs of sickness at all. They crowing, lively, eating, mating and showing off. They don't scratch at the eyes or anything, and their breathing in perfect with no noises or coughs. The eye itself looks normal - no discharge or redness. I have run out of ideas what to do next.........any advice? (they are no isolated and I don't think its contagious as none of the other roosters or chickens have caught it all this time).