Scotopic vision

In <a href="/facts/Vision_science/M2ANjNn7">the study</a> of <a href="/facts/Visual_perception/g7Tfaq2l">visual perception</a>, scotopic vision (or scotopia) is the vision of the <a href="/facts/Eye/h3lbYU55">eye</a> under low-<a href="/facts/Light/jeofpMn4">light</a> conditions. The term comes from the <a href="/facts/Ancient_Greek/LIK7NlUh">Greek</a> skotos, meaning 'darkness', and -opia, meaning 'a condition of sight'. In the <a href="/facts/Human_eye/a24ua4fy">human eye</a>, <a href="/facts/Cone_cell/JoQeEzoF">cone cells</a> are nonfunctional in low <a href="/facts/Visible_spectrum/frPBh8o5">visible light</a>. Scotopic vision is produced exclusively through <a href="/facts/Rod_cell/mNd9Sf1E">rod cells</a>, which are most <a href="/facts/Photosensitivity_in_humans/XwkmnUfg">sensitive</a> to <a href="/facts/Wavelength/kcJU0ymz">wavelengths</a> of around 498 nm (blue-green) and are insensitive to wavelengths longer than about 640 nm. Under scotopic conditions, light incident on the retina is not encoded in terms of the <a href="/facts/Spectral_power_distribution/fuKAFqtu">spectral power distribution</a>. Higher visual perception occurs under scotopic vision as it does under photopic vision.

Scotopic vision open-in-new

Scotopic vision