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Related Concept Videos

Color Vision01:24

Color Vision

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Color perception begins in the retina, the light-sensitive layer at the back of the eye. Two main theories explain how colors are seen: the trichromatic theory and the opponent-process theory. The trichromatic theory, proposed by Thomas Young in 1802 and extended by Hermann von Helmholtz in 1852, suggests that color vision is based on three types of cone receptors in the retina. These cones are sensitive to different but overlapping ranges of wavelengths corresponding to red, blue, and green.
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Photoreceptors and Visual Pathways01:22

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Perceptual Constancy01:12

Perceptual Constancy

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Perceptual constancy is the ability to recognize that objects remain consistent and unchanged even when their appearance varies due to changes in sensory input. There are four main types of perceptual constancy: size constancy, shape constancy, color constancy, and brightness constancy.
Size constancy is the recognition that an object remains the same size, even when its image on the retina changes. For instance, a bus is perceived to be large enough to carry people, even if it looks tiny from...
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Vision01:24

Vision

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Depth Perception and Spatial Vision01:15

Depth Perception and Spatial Vision

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Depth perception is the ability to perceive objects three-dimensionally. It relies on two types of cues: binocular and monocular. Binocular cues depend on the combination of images from both eyes and how the eyes work together. Since the eyes are in slightly different positions, each eye captures a slightly different image. This disparity between images, known as binocular disparity, helps the brain interpret depth. When the brain compares these images, it determines the distance to an object.
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Color Vision in the Mountains.

Harvey V Lankford1, Jeffery K Hovis2

  • 1Endocrinology and Nuclear Thyroidology (retired), Richmond, VA.

Wilderness & Environmental Medicine
|September 29, 2023
PubMed
Summary
This summary is machine-generated.

Hypoxia and extreme brightness at high altitudes can alter color perception, making reds appear grayer. This study analyzes environmental factors impacting vision, including glare and contrast, beyond just oxygen levels.

Keywords:
Himalayaaltitudechromaticityhypoxiailluminationmountaineering

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Area of Science:

  • Environmental Science
  • Neuroscience
  • Ophthalmology

Background:

  • Environmental factors like hypoxia and illumination significantly affect human physiology.
  • Color perception is complex and can be influenced by various external stimuli and physiological states.

Purpose of the Study:

  • To explore the effects of environmental conditions on the eye, central nervous system, and color perception.
  • To analyze an instance of altered red color perception during a high-altitude climb.

Main Methods:

  • Review of historical scientific, aviation, medicine, and mountaineering literature.
  • Analysis of an informal observation of color perception changes during a Himalayan climb.

Main Results:

  • Altered perception of red color on playing cards at high altitude was observed.
  • The effect was attributed to a combination of hypoxia, glare, and contrast, not solely hypoxia.

Conclusions:

  • Environmental factors, including glare and contrast in bright lighting, significantly impact color vision at altitude.
  • Understanding these complex interactions is crucial for interpreting visual perception in extreme environments.