between the eye of a rabbit and man the data indicate that large yield high altitude bursts may involve some hazard to the human eye out to the horizon so long as the point of burst is in direct line of sight. This applies only to the instant of burst. As a fireball rises above the horizon the instant of high thermal energy release has past. Also, normal human reflexes of blinking or turning away should further insure.) Evaluation - Past procedures employed of closing highways and air lanes and keeping large yield high altitude shots (near or 7) below the horizon (check this) at the instant of burst have resulted in no reported injury to the eyes of persons off-site. 32. ee