 Much research went into the potential eyeburn problem.One of the official reports for the project stated that, for the altitudes planned for the "Bluegill, Kingfish" and "Checkmate" tests, "the thermal-pulse durations are of the same order of magnitude or shorter than the natural blink period which, for the average person, is about 150 milliseconds.Furthermore, the atmospheric attenuation is normally much less for a given distance than in the case of sea-level or near-sea-level explosions.