the.com/night vision
seeing in the dark by drinking light one photon at a time.
means the ability, natural or engineered, to form images from tiny amounts of visible or infrared light that human eyes alone can't use.
from military labs in wwii built the first active infrared scopes for snipers; by vietnam, image intensifier tubes turned starlight itself into a faint green glow, no infrared spotlight needed.
the green tintchosen because eyes distinguish more shades of green
cat eyestapetum lucidum reflects light back through retina twice
generations mattergen 3 tubes amplify light nearly 30,000 times
thermal is differentreads heat, not light, works in total blackout
for instance
deep sea anglerfish — eyes tuned to catch bioluminescent flashes at 1000m
owl retinas — rod cells packed so dense they see by starlight
call of duty goggles — pop culture's green-glow shorthand for stealth missions