. ri : ed wal Project 4.1 - Flash Blininess - Colonel %. S. Fixott OBJECTIVES To gain information regamiing the behavior of lid reflexes under the high 4lluminstion produced by atomic jevices; to further evaluate the blink reflexes as a protective mechanism against chorioretinal burns, To gain information on shutter anid filter mechanisms for eye protection against chorioretinal buns causet by atomic weapons of warious types ani yields. INSTRUMENTATION The basic ins usei for entation for thig Lacrosse), Because of failure to protuce shot was identical with that (Cherokee) and (Zunt). lesions at previous!)releulated distances in the earlie- events, permission vas obtained *o use four additional exposure sites; TOM, (TRIAH, VAN and CHINIE"RC (AIVIN); vhioh are nearer to ground sero than the original exposure facility at JAPTAN (DAVID). While this change 414 not entirely succeei in bracketing the threshold of burn protuction, it dii, however, produce a spectrum of burn severity which otherwise would not have been obtaina'tle on any eingle shot. Flectronic instrumentation and timing signale were employed only at the station on JAPTAN (DAVID). ‘Tempora-y racks, holding ten rabbits each, were used for each of the four forward sites, Animals placed in these racks were used for blink reflex ant filter studies on’y. mui General BEST AVAILABLE COPY ‘ Chorioretinal burns vere produced in 42 of 113 rabbits and 6 of 8 | 424