direct vision

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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direct vision

n.

See central vision.

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vision (vizh´n),

n sight; the faculty of seeing.

vision, direct,

n the category of sight in which an image is focused directly on the macula of the retina. Also called
central vision.

vision, field of,

n the portion of space that the fixed eye can see.

vision, indirect,

n 1. in dentistry, the capacity to see the treatment area by using a oral cavity mirror.
n 2. the category of sight in which an image is focused on an area of the retina other than the macula. Also called
peripheral vision.

Indirect vision.

vision, stereoscopic,

n vision in which the visual fields of the two eyes are unified. Sensations from a common object received by the two eyes are superimposed, and as a result of the slight differences in the fields and the superimposition of the fields, the effects of depth and shape of the object are attained.