Eye discharge is fairly common in cats. It can have many different causes, from allergies to tear duct issues. But if a cat has gunky discharge accompanied by redness, it's a safe bet she has conjunctivitis (AKA pink eye). Holly M. writes:
Holly, it sounds like a good diagnosis, especially since you saw immediate results from the prescribed medication. Sometimes conjunctivitis can be difficult to eliminate completely. Conjuctivitis just means that Lita has an infection of the eye's surface which is called the conjunctiva. The cause can be a physical irritant, a bacteria or a virus.
If Lita's conjunctivitis was caused by feline herpesvirustype 1, it can be particularly hard to get rid of. The virus can go into remission only to spring back into action later. To know if FHV-1 is the culprit, your veterinarian will need to take a culture from Lita's eye for analysis. If the topical treatment Lita was prescribed won't work long-term, she may need to be put on an anti-viral medication, but there's no need to jump to that conclusion just yet.
Talk to your veterinarian. Chances are she or he has seen this many times before. We feel certain you'll be able to get this little problem under control. We wish you and Lita all the best!