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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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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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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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Glaucoma: Overview01:25

Glaucoma: Overview

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Glaucoma is an eye condition characterized by increased intraocular pressure that damages the retina and optic nerve, leading to irreversible blindness if left untreated. The human eye has various components, including the cornea, iris, pupil, lens, and optic nerve. Aqueous humor is secreted by the epithelium of the ciliary body in the posterior chamber and flows through the trabecular meshwork and canal of Schlemm, maintaining normal intraocular pressure. The trabecular meshwork and the canal...
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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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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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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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Related Experiment Video

Updated: Apr 14, 2026

Dynamic Visual Tests to Identify and Quantify Visual Damage and Repair Following Demyelination in Optic Neuritis Patients
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Vision and multiple sclerosis.

Simon J Hickman1, Naz Raoof2, Rebecca J McLean3

  • 1Department of Neurology, Royal Hallamshire Hospital, Glossop Road, Sheffield S10 2JF, UK.

Multiple Sclerosis and Related Disorders
|April 17, 2015
PubMed
Summary
This summary is machine-generated.

Multiple sclerosis (MS) impacts vision through various conditions like optic neuritis and uveitis, and treatment side effects. This review covers recognizing visual problems in MS patients and available treatments for vision improvement.

Keywords:
DiplopiaMultiple sclerosisNystagmusOptic neuritisOscillopsiaVision

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Area of Science:

  • Ophthalmology
  • Neurology
  • Clinical Medicine

Background:

  • Multiple sclerosis (MS) is a chronic neurological disease impacting the central nervous system.
  • Visual disturbances are common in MS, affecting multiple aspects of sight.
  • Ocular conditions and treatment side effects can further complicate vision in MS patients.

Purpose of the Study:

  • To comprehensively review the diverse ways multiple sclerosis affects vision.
  • To discuss the recognition of visual impairments in individuals with MS.
  • To outline current and emerging treatments for vision improvement in MS.

Main Methods:

  • Literature review of scientific articles and clinical studies.
  • Synthesis of information on MS-related visual conditions.
  • Analysis of treatment options for visual symptoms in MS.

Main Results:

  • MS can cause optic neuritis, neuropathy, visual field defects, and cortical processing issues.
  • Nystagmus, double vision, and uveitis are also associated with MS.
  • New MS treatments may present unique visual side effects.

Conclusions:

  • Understanding the multifaceted nature of MS-induced visual dysfunction is crucial.
  • Early recognition of visual problems aids timely intervention.
  • A range of therapeutic strategies can help manage and improve vision in MS patients.