While both ocular herpes simplex and herpes zoster ophthalmicus can cause a red, painful eye, there are some important distinctions to make when diagnosing and treating each of these entities.  

Any chemical exposure to the eyes is a true emergency until proven otherwise. 

Does the sight of a slit lamp intimidate you?  Then look no further!  Review this quick "how to" guide to get started with assessing the anterior chamber on slit lamp exam.