noun
night vision; seeing in the dark
Most commonly used in the set phrase 夜目が利く (to have good night vision). Rarely used alone.
See also: 夜目が利く
猫は夜目が利く。
Cats have good night vision.
夜目が利かないので、暗い道は危ない。
I can't see well in the dark, so dark roads are dangerous.
暗視 is a technical term for night vision (e.g., devices), while 夜目 is a more everyday word for the ability to see in the dark.
Compound of 夜 (night) and 目 (eye). The exact historical derivation is uncertain, but the meaning is transparent.