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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from U. S. Project Trinity Report by Carl Maag and Steve Rohrer: distribution of welder's filter glass. Because it was not known
exactly how the flash might affect eyesight, it was suggested that
direct viewing of the fireball not be attempted even with this
protection. The recommended procedure was to face away from ground
zero and watch the hills or sky until the fireball illuminated the
area. Then, after the initial flash had passed, one could turn around
and view the fireball through the filter glass. Despite these
well-publicized instructions, two participants did not take
precautions. They were temporarily blinded by the intense flash but
experienced no permanent vision impairment (1; 17).
People as far away as Santa Fe and El Paso saw the brilliant light of
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