The cornea is the window of your eye. It is the clear glass-like front. The herpes simplex virus is very common.
Most people have a herpetic infection at some time of their lives.
However, only in a few unlucky people does the virus affect the cornea. No one knows why some people develop corneal infections not others. A dendritic ulcer has many fingers , like the branch of a tree. It can be seen with the slit lamp microscope used to examine your eye. Fluorescent yellow drops are used to show the ulcer up more easily.