[CAU--an accessory device for automatic monitoring and evaluation of fixation with the computer perimeter Competer]

During perimetry with the "Competer" fixation is tested by random switching of a projector lamp which has to be directed manually into the individual blind spot before the test is started. In order to improve efficiency with regard to time required, acceptance, and validity of the test, a device has been designed which rapidly locates the center of the blind spot and verifies it by random checks. Both the test logic and the design and operating features of this device, which works independently of the parent apparatus, are described in detail.