Aspects on the design of an automatic perimeter.

Since the first description (1976) of the computerized perimeter Competer, some small modifications and new routines have been introduced. An account of a new mode for presentation of the test results and a procedure for their storage is therefore provided. Some elementary technical facts are included to make the relations computer--computer language--perimeter comprehensible. The construction of efficient test logics is discussed and the meaning of "threshold level" explored.