There are a number of conditions which can be associated with the symptoms you describe including herpes infections of the eye,
herpes zoster or
simplex, changes that occur with diabetes,
trigeminal neuralgia, tumors, prior irradiation treatment, incomplete eyelid closure,and trauma of the eye. However, a complete eye examination should be performed to determine the cause of his symptoms. I would recommend that he continue to seek an eyeMD care if his symptoms persist.
Dr. Feldman
Sandy T.