I knew that my chickens have eye worms, since I saw several of them whenever I look on the upper part of their eye. However, about 2 weeks after putting them in a cage so that they will no longer eat those cockroaches, I no longer see the eyeworms. Where could they be? I didn't put any effective solution on their eye on that time, since I don't have it yet. Could it be that they migrate somewhere after reaching a certain age?