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phenomena may be significant in the development of a comprehensive
subjectivegrading system analogous to that used in the evaluation
of the cutaneous flash burns,
Staggered Shutter Studies
Retinal burns were sustained by 10 of 32 rabbits exposed behind
staggered shutters at JAPTAN (DAVID).
According to preselected shutter
timing, two burns were produced during the initial 7-to-10 ms of the
weapon flash.
Both burns were located centrally in the rabbit eye
and appeared almost pin-point in size.
These lesions, while definitely
minimal, were nevertheless discernible on a 24 hour re-check when they
were documented by fundus photography.
Since the time of the first minimum is calculated as occuring
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it would seem that the burns were produced by the energy
of the first pulse alone,
If true, this finding becomes of interest in
considering the time of closing for protective shutters,
The low in-
cidence (12.5 percent) of burns during the first 50 ms of the explosion
somewhat minimizes the possibility of significant injury produced by
the first pulse,
Staggered shutter exposures to the initial 60-to-250 ms of the
detonation caused burns in about 50 percent of animals exposed during
these intervals, The time to the second maximum is calculated at Exgjiees
it is apparent that this group of animals were subjected, not only to
the energy of the first flash but also the greater portion of the second
pulse.
Resolution of actual shutter speed in all cases is contingent
upon appraisal of the high speed photography accomplished at the time
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of the explosion,
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