photopic vision

photopic vision

n.

See photopia.

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photopic vision

[fōtop′ik]

daylight vision, which depends primarily on the function of the retinal cone cells.

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vision

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.

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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

diplopia.

half vision

hemianopia.

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.