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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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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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Colors and Magnetism03:02

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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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Depth Perception and Spatial Vision01:15

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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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Toxidromes: Clinical Features01:30

Toxidromes: Clinical Features

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Toxidromes are specific patterns of symptoms resulting from toxic substance exposure. They help in the identification and treatment of poisoning. The symptoms of each toxidrome group indicate poisoning by a certain class of chemicals or drugs.1. Sympathomimetic: Stimulates the sympathetic nervous system. Symptoms include agitation, increased heart rate (HR), blood pressure (BP), respiratory rate (RR), temperature, and pupil size. Drugs like cocaine and amphetamines, along with tremors and...
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COPD: Pathogenesis and Clinical Features01:20

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Chronic obstructive pulmonary disease (COPD) is a group of lung conditions that progressively worsen over time, including chronic bronchitis and emphysema. This cluster of diseases collectively leads to a gradual and irreversible decline in lung function over time.
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Color Vision 2018: Introduction by the feature editors.

Steven L Buck, Rigmor Baraas, Jan Kremers

    Journal of the Optical Society of America. A, Optics, Image Science, and Vision
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    Summary
    This summary is machine-generated.

    This special issue highlights current research in color vision, featuring studies presented at the International Colour Vision Society symposium. It covers both fundamental and applied aspects of how we see color.

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    Area of Science:

    • Optics and Vision Science
    • Psychophysics
    • Physiological Optics

    Background:

    • The Journal of the Optical Society of America A (JOSA A) presents a special issue focused on color vision.
    • This collection features research from the International Colour Vision Society (ICVS) community.

    Purpose of the Study:

    • To showcase recent advancements in basic and applied color vision research.
    • To provide a platform for findings presented at the 24th Biennial Symposium of the ICVS.

    Main Methods:

    • The articles are primarily based on presentations from the ICVS symposium.
    • Research spans various methodologies within color vision science.

    Main Results:

    • The issue reflects the diverse interests and current research trends within the color vision community.
    • Key findings from the symposium are disseminated to a wider audience.

    Conclusions:

    • This feature issue serves as a valuable resource for researchers and practitioners in the field of color vision.
    • It underscores the dynamic nature of research in understanding human color perception.