Sight involving the eye's rods, which respond to low levels of lighting, below .034 candela per square meter, or .01 footlamberts.

night vision

Vision under relatively low light levels when the visual response is primarily controlled by the rods.

The ability to see under low lighting conditions

Scotopic vision is the monochromatic vision of the eye in dim light. Since cone cells are nonfunctional in low light, scotopic vision is produced exclusively through rod cells so therefore there is no colour perception. Scotopic vision occurs at luminance levels of 10-2 to 10-6 cd/m².