scotopic vision(redirected from twilight vision)
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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)
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.
vision characterized by lack of color vision.
vision after lens removal.
the use of both eyes together, without diplopia.
that produced by stimulation of receptors in the fovea centralis.
visual perception in the daylight or under conditions of bright illumination.
vision with one eye.
visual perception in the darkness of night or under conditions of reduced illumination.
360° vision conferred on grazing herbivora by the lateral placement of their eyes.
that produced by stimulation of receptors in the retina outside the macula lutea.
vision in bright illumination.
vision in low illumination.
see visual acuity test.