One of my best horses had something in his eye. It was tearing for 6 weeks. The vet couldn't find anything in there, and the ointment (silver sulfadiazine) did little to help. After a couple weeks using the ointment, I used colloidal silver and just kept flushing the eye several times a day. Finally, one day when I flushed, a small twig came out from the lower part of his eye. The vet had sedated, and really got a good look in there, but couldn't find it. I've had very good luck with colloidal silver and eye problems. Good luck. I agree, the third eye doesn't look right.