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Related Concept Videos

Vision01:24

Vision

59.4K
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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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.
Once through the pupil, the light passes through the lens, a...
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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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Association Areas of the Cortex01:21

Association Areas of the Cortex

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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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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Related Experiment Video

Updated: Jan 18, 2026

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Cortical visual field representation and data integration following optic neuritis.

Ruth Abulafia1, Pieter B de Best1, Ayelet McKyton1

  • 1Department of Neurology, Hadassah Medical Organization and Faculty of Medicine, The Hebrew University of Jerusalem, POB 12,000, Jerusalem 91120, Israel.

Neuroimage
|September 11, 2025
PubMed
Summary

Brain adaptation helps vision recovery after optic neuritis (ON), an inflammatory optic neuropathy. Studies show altered visual cortex processing in ON patients, suggesting a spatial adaptation mechanism for visual function restoration.

Keywords:
Connective fieldMultiple sclerosisOptic neuritisReceptive fieldSampling extentfMRIpRF

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Neuroimaging

Background:

  • Optic neuritis (ON) is an inflammatory optic neuropathy often linked to multiple sclerosis.
  • Vision loss in ON typically resolves within weeks, with spontaneous remyelination and potential brain adaptation contributing to recovery.

Purpose of the Study:

  • To investigate brain adaptation by examining cortical visual field representation and data integration in the first year after a first-episode ON.
  • To understand how the visual cortex reorganizes following optic neuritis.

Main Methods:

  • Functional magnetic resonance imaging (fMRI) was used on 8 ON patients and 10 controls.
  • Population receptive field (pRF) and connective field (CF) modeling were applied to early visual cortex (V1-V3) under monocular and binocular viewing conditions.

Main Results:

  • Controls showed typical increases in pRF and CF sizes along the visual hierarchy.
  • ON patients displayed absent pRF size increase in V3 for the unaffected eye and larger CF sizes for the affected eye compared to the unaffected eye.

Conclusions:

  • Cortical changes in ON patients may represent a spatial adaptation mechanism.
  • These findings suggest the brain reorganizes visual processing to compensate for vision impairment due to optic neuritis.