In the treatment of basal cell carcinoma there are still diagnostic and therapeutic problems. The wrong diagnosis resulting in inadequate treatment can lead to loss of the bulbus. In the following study 226 patients were operated on for basal cell carcinoma between 1980 and 1990. In 179 patients a primary eyelid tumor was removed and the rate of recurrence was 5.0%. In 47 patients with secondary eyelid tumors (recurrent tumors) a recurrence rate of 14.8% was found. The examination methods, surgical treatment and results are presented.