Scotopic vision

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Electromagnetic spectra visible by the human eye.

Scotopic vision is that visual perception that occurs with very low levels of illumination. Visual acuity is low and light reception is mainly with the rods of the retina, which are sensitive to the blue color of the spectrum (and therefore, red-blind). Color discrimination is not possible in this type of vision: it is monochromatic vision.

Physiology

In the retina of the human eye there are two types of receptor cells, sensitive to the area of the electromagnetic spectrum known as light: rods and cones. Both have different properties and operate under different conditions. There is only one type of rod that operates under low light conditions and three types of cones whose preference is for high light intensity.

Another characteristic of scotopic vision is that, as the rods are located in the periphery of the retina (about 6º from the fovea), it is a peripheral visual perception.