119 patients who were believed to suffer from orbital tumors were investigated by A-scan ultrasonic studies. 67 turned out to have significant signs of an orbital tumor, 52 were found to be unsuspicious. In all of the 32 surgical procedures, which were additionally performed, the ultrasonic diagnosis could always be verified. Moreover 13 ultrasonic studies led to certain pathological specifications of the tumor and 10 of them could be proved true by histology later on. This paper discuss the advantage of the A-scan ultrasound investigations of the orbit. The efficiency concerning an ultrasonic specification of the tumorous tissue is to be emphasized.