Young female victim of Hiroshima. Photo was taken in 1963.
In seven-tenths of a millisecond after the explosion, up to the distance of 60 miles, light from a 1 Megaton nuclear bomb is 30 times brighter than the Sun. Light this strong would cause instant, severe burns to the retinas. At a distance of up to 6 miles, the heat wave would cause melting of the eyeballs and 3rd degree burns.