This is what Ally had when I first found her. That is if you're talking about pus in the discharge.
Taking her to a clinic would be a good idea, but for the eye discharge here's what you do:
Go to the local pharmacy and get eye wash (yes, the standard kind we use on people - it's just filtered/distilled water). Hold her eyes open one at a time and squeeze some of the eye wash in there, then wipe with a clean gauze (always a clean gauze!). Then, get some Vetropolycin at your vet. Put a little bit in each eye and rub it around (you'll have to hold her eyes open as you do this otherwise it won't get in there). Wipe the excess on the eye lids, particularly on the edges.
That was what cured Ally's really bad eye infection with lots of discharge. She couldn't even open her eyes at one point.