The form of keratitis described by Mooren1 in 1867 as chronic serpiginous or rodent ulcer may not be familiar to some ophthalmologists, as it is rare. Only seventy cases were found in a recent review of the literature by Heintz,2 and he quoted only two reports by Americans, those of H. Gifford and Verhoeff. Bedell3 recently quoted two typical cases, both resulting in loss of the eye. It is not so rare, however, but that most ophthalmologists of experience should see one or more cases during a lifetime. Heintz reported five typical cases from the Kiel clinic, and I have seen at least six.
Mooren's original description of the condition, which he first separated from the group of marginal ulcers, is as follows :
The disease always begins at the margin of the cornea, progresses forward in irregular processes and does not stop, so far as my