Hello Andrew, I'm Dr. Deb.
I recently came online and see that your question about your cat hasn't been answered. I'm so sorry that you've had to wait for a response,but if you still need assistance, I'd like to help if I can.
A picture would be extremely helpful. It's not always the easiest thing to do on this site but the following link walks you through it.
I have a few other questions to ask as well, if you don't mind:
1. How long has the discharge been present?
2 Any rubbing of the eye? Any squinting? I assume not but just want to confirm.
3. Any sneezing (now or in the past)?
There may be a delay after I receive your answers since I have to type up a response to you and I may be offline at the time you respond. But I'll get back to you as soon as I can since I'm on the computer some part of every day.
Thanks for your patience. Deb