0' ABSTRACT Ten volunteers were exposed to high intensity double pulse light flashes with flash fields subtending l-, 3?, 50, 10P, and 15q of visual angle. Flashblindness recovery times for several aircraft instruments were measured for each flash field diameter, Countermeasures including looking around the afterimage and body movement were permitted on some of the trials. Recovery time increased as the adapting flash visual angle was increased from 10 to 15!. Instruments requiring a greater visual acuity, to be read had substantially longer recovery times than instruments requiring less. The two countermeasures 'listed above were found' to be helpful in reducing recovery time.