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Related Concept Videos

Visual Agnosia01:12

Visual Agnosia

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Color Vision01:24

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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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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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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.
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Visual System01:26

Visual System

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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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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Related Experiment Video

Updated: Apr 20, 2026

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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[The visual snow phenomenon.]

O Zambrowski1, I Ingster-Moati2, C Vignal-Clermont3

  • 1Service d'ophtalmologie, hôpital universitaire Necker-Enfants malades, 149, rue de Sèvres, 75743 Paris cedex 15, France; Service d'ophtalmologie, centre hospitalier intercommunal, 40, avenue de Verdun, 94000 Créteil, France.

Journal Francais D'Ophtalmologie
|December 3, 2014
PubMed
Summary
This summary is machine-generated.

Visual snow is a persistent, snow-like vision symptom. This study precisely characterizes visual snow, supporting its organic origin and exploring its unclear pathophysiology.

Keywords:
Entoptic phenomenonMigraineNeige visuellePalinopsiaPalinopsiesPhotopsiaPhotopsiesPhénomène entoptique du champ bleuSnow vision

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Area of Science:

  • Ophthalmology
  • Neurology
  • Visual Neuroscience

Background:

  • Visual snow is a poorly recognized symptom characterized by persistent, snow-like vision.
  • Associated symptoms include palinopsia, blue field entoptic phenomenon, and photophobia.

Purpose of the Study:

  • To precisely characterize the symptoms of visual snow.
  • To discuss the potential pathophysiology of visual snow.

Main Methods:

  • Prospective study of 12 patients diagnosed with visual snow between 2010-2012.
  • Comprehensive ophthalmologic examinations including visual field, color vision, electroretinography, and visual evoked potentials were performed.

Main Results:

  • The study confirmed reproducible symptoms in visual snow patients.
  • Associated symptoms included palinopsia (50%), blue field entoptic phenomenon (40%), photophobia (30%), and migraine (30%).
  • A history of toxic intake was reported in 20% of cases.

Conclusions:

  • The consistent symptom presentation supports an organic basis for visual snow.
  • The exact pathophysiology remains elusive, with current hypotheses insufficient to fully explain the symptoms.