I have a 13 yr old mare who has had a whitish discharge coming out of both her eyes for over a month now. At first we chalked it up to allergies but considering the weather now, allergies cannot be the case. The vet is coming out next week but I would like to get some sort of an idea what is going on before that. Her eyes are not swollen at all and they are quite clear... it's just every morning I have to remove a lot of crusty pus from the corner of each eye (which she loves). Her eyes do not seem to be in any pain and everything else about her is perfectly normal... as soon as I remove the build up though it always comes right back... any ideas?