An electronic analog device has been constructed which displays synthesized interferograms on a cathode-ray tube (CRT) for real time viewing. First- and third-order aberrations are generated individually or in combination. The exact amount of each aberration (in waves) appearing in the simulated interferogram is also displayed. A radial line cursor adjustable over 360 degrees in the artificial exit pupil provides profile information about the wavefront along the vector. A 3-D presentation of the wavefront is also included.