A contagious eye infection, can be caused by bacteria, viruses, or chlamydia among other things. May spread through the whole herd. Severe cases may cause temporary blindness, so be sure affected animals eat regularly. Treat affected goats with an antibiotic such as Terramycin eye ointment. The label of this antibiotic recommends treating not only affected goats but all goats at least once at the first sign of pinkeye in a herd.