tunnel vision (redirected from Tunnelvision)

vision /vi·sion/ (vizh´un)

1. the sense by which objects in the external environment are perceived by means of the light they give off or reflect.

2. the act of seeing.

3. an apparition; a subjective sensation of seeing not elicited by actual visual stimuli.

4. visual acuity.

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achromatic vision  monochromatic vision.

anomalous trichromatic vision  defective color vision in which a person has all three cone pigments but one is deficient or anomalous but not absent.

binocular vision  the use of both eyes together without diplopia.

central vision  that produced by stimuli impinging directly on the macula retinae.

chromatic vision  color v.

color vision 

1. perception of the different colors making up the spectrum of visible light.

2. chromatopsia.

day vision  visual perception in the daylight or under conditions of bright illumination.

dichromatic vision  defective color vision in which one of the three cone pigments is missing; the two types are protanopia and deuteranopia.

direct vision  central v.

double vision  diplopia.

indirect vision  peripheral v.

low vision  impairment of vision such that there is significant visual handicap but also significant usable residual vision.

monochromatic vision  complete color blindness; inability to discriminate hues, all colors of the spectrum appearing as neutral grays with varying shades of light and dark.

monocular vision  vision with one eye.

multiple vision  polyopia.

night vision  visual perception in the darkness of night or under conditions of reduced illumination.

oscillating vision  oscillopsia.

peripheral vision  that produced by stimuli falling on areas of the retina distant from the macula.

solid vision , stereoscopic vision perception of the relief of objects or of their depth; vision in which objects are perceived as having three dimensions.

trichromatic vision 

1. any ability to distinguish the three primary colors of light and mixtures of them.

2. normal color vision.

tunnel vision 

1. that in which the visual field is severely constricted.

2. in psychiatry, restriction of psychological or emotional perception to a limited range.

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tunnel vision

n.

Vision in which the visual field is severely constricted.

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tunnel vision

Etymology: OFr, tonnel, fowl trap; L, videre, to see

a defect in sight in which there is a great reduction in the peripheral field of vision, as if looking through a hollow tube or tunnel. The condition occurs in advanced glaucoma.

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tunnel vision,

n a defect in sight in which a great reduction occurs in the peripheral field of vision, as if one is looking through a hollow tube or tunnel.

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tunnel vision

Neurology A functional concentric constriction of both visual fields; the absolute size of the visual fields is the same regardless of distance from object being viewed Etiology Degeneration of calcarine cortex, seen in methylmercury poisoning, often accompanied by multiple scotomata, ↓ auditory acuity, changed mental status; infarction of sensory relay nuclei of the thalamus with relative sparing of the occipital lobes; functional cause of TV is hysterical reaction or hypersuggestibility. See Mercury. Cf 'Tunnel vision' Vox populi Popular for a myopic perspective adopted by a person, group, or organization.