Visual acuity test

Visual acuity test

An eye examination that determines sharpness of vision, typically performed by identifying objects and/or letters on an eye chart.

Mentioned in: Optic Neuritis

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visual

pertaining to vision.

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visual acuity test

performed by walking the animal through an obstacle course. A room full of unfamiliar furniture, or a stairway is usually used for companion animals. Farm animals are led or driven through a passage with drums or boxes strewn across it.

visual cortex

the part of the cerebral cortex which deals with images received by the visual apparatus.

visual evoked potentials (VEPs)

see visual evoked response.

visual following

movement of the eyes in watching a moving object.

visual pathway

the bulk of the retinal ganglion cells have axons in the optic nerve which synapse with cells in the lateral geniculate nucleus in the thalamus, which project to the visual cortex in the occipital lobe of the cerebrum; in a secondary visual pathway the axons of the remainder of the retinal ganglion cells terminate in the anterior rostral colliculus (pretectal region).

visual system

includes the eye, the optic nerve and the optic cortex in the cerebrum. The oculomotor, trochlear, abducent, trigeminal and facial nerves are all involved in reflexes which are part of the animal's responses to visual stimuli.

visual yellow

all-trans retinal; see retinal (2).