scotopic vision

(redirected from twilight vision)
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sco·top·ic vis·ion

vision when the eye is dark-adapted.
See also: dark adaptation, dark-adapted eye.

scotopic vision

Etymology: Gk, skotos, darkness; L, visio, seeing
the ability of the eye to adjust for vision in darkness or dim light. See also night vision.

sco·top·ic vi·sion

(skō-top'ik vizh'ŭn)
Vision when the eye is dark adapted.
See also: dark adaptation, dark-adapted eye
Synonym(s): night vision, scotopia.


the faculty of seeing; sight.
The basic components of vision are the eye itself, the visual center in the brain, and the optic nerve, which connects the two. Abnormalities of vision in animals can only be inferred by an assessment of the animal's response to a variety of visual stimuli. The commonly used tests of vision are the menace reflex test, the watching of a moving object and the obstacle test. These can all be performed in subdued light as a test for night blindness.

achromatic vision
vision characterized by lack of color vision.
aphakic vision
vision after lens removal.
binocular vision
the use of both eyes together, without diplopia.
central vision
that produced by stimulation of receptors in the fovea centralis.
day vision
visual perception in the daylight or under conditions of bright illumination.
double vision
half vision
monocular vision
vision with one eye.
night vision
visual perception in the darkness of night or under conditions of reduced illumination.
panoramic vision
360° vision conferred on grazing herbivora by the lateral placement of their eyes.
peripheral vision
that produced by stimulation of receptors in the retina outside the macula lutea.
photopic vision
vision in bright illumination.
scotopic vision
vision in low illumination.
vision test
see visual acuity test.