Uploaded August 2026 | Updated September 2026, 2 weeks ago
Nuclear explosions produce intense light and thermal radiation that can seriously injure the eyes and skin. Flash blindness is a temporary vision loss lasting minutes, which can occur up to dozens of kilometers away at night. Retinal burns are permanent damages caused by the lens focusing thermal energy onto the retina—rare but possible at very long ranges. Ultraviolet radiation primarily harms the cornea and lens, leading to cataracts, rather than the retina. The thermal flash, carrying about 35% of the explosion's energy, produces skin burns and widespread fires; the blink reflex is too slow to block its first pulse. U.S. nuclear effects research quantified these hazards through actual tests (including high‑altitude bursts) and established safety distances and protective standards based on the findings.
Nuclear explosions produce intense light and thermal radiation that can seriously injure the eyes and skin. Flash blindness is a temporary vision loss lasting minutes, which can occur up to dozens of kilometers away at night. Retinal burns are permanent damages caused by the lens focusing thermal energy onto the retina—rare but possible at very long ranges. Ultraviolet radiation primarily harms the cornea and lens, leading to cataracts, rather than the retina. The thermal flash, carrying about 35% of the explosion's energy, produces skin burns and widespread fires; the blink reflex is too slow to block its first pulse. U.S. nuclear effects research quantified these hazards through actual tests (including high‑altitude bursts) and established safety distances and protective standards based on the findings.
