If the eye isn't "running" or "weeping" then it is probably an old case of pinkeye. If there is any seepage down her face then it is probably new, either pinkeye or an abrasion like TCRanch said. We also have used the infusible - in the udder - mastitis formulas like "today" or a penicillin based one in the eye. It seems to soothe the eye a bit as well as deliver some antibiotic. Just lift the eyelid a bit and squeeze a little & let the blinking of the eye spread it. There are other, probably better, things like the Vetericyn, but since I have a couple of dairy cows, the mastitis stuff is usually more available, and it seems to work. Along with a shot of LA300. Some people here in this area have said they really prefer using a dose of Draxxin. We have had a new strain of pinkeye the last 2 years according to a local vet that was treating several beef cows in one herd and a friends dairy heifers were across the fence and they got it also.