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Related Concept Videos

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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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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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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Prosopagnosia01:24

Prosopagnosia

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Prosopagnosia, also known as face blindness, is the inability to recognize faces. In severe cases, individuals with prosopagnosia may not recognize close family members, including parents and spouses, by their faces. For instance, someone with prosopagnosia might walk past their child in a crowd, only realizing their mistake upon noticing their child's distinctive backpack or favorite jacket. Prosopagnosia specifically impairs facial recognition, while the recognition of other objects or...
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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: Nov 7, 2025

3D-Neuronavigation In Vivo Through a Patient's Brain During a Spontaneous Migraine Headache
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Visual Perception in Migraine: A Narrative Review.

Nouchine Hadjikhani1,2, Maurice Vincent3

  • 1Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02129, USA.

Vision (Basel, Switzerland)
|April 30, 2021
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Summary

Migraine impacts visual processing due to neural hyperexcitability. Understanding these visual disturbances is crucial for effective migraine management and examination.

Keywords:
Alice in Wonderland Syndromemigraine auravision

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Area of Science:

  • Neurology
  • Ophthalmology
  • Neuroscience

Background:

  • Migraine is a common neurological disorder impacting visual processing.
  • Visual disturbances in migraine are often linked to neural hyperexcitability.
  • Evidence from clinical, physiological, and neuroimaging studies supports this link.

Purpose of the Study:

  • To review the effects of migraine on simple visual functions.
  • To describe complex visual disturbances, including Alice in Wonderland Syndrome.
  • To discuss visual triggers of migraine attacks.

Main Methods:

  • Literature review of studies on migraine and visual function.
  • Analysis of clinical, physiological, and neuroimaging data.
  • Synthesis of information on visual disturbances and triggers.

Main Results:

  • Migraine affects simple visual functions like pattern and color perception.
  • Complex visual phenomena, such as Alice in Wonderland Syndrome, are observed.
  • Specific visual stimuli can precipitate migraine attacks in susceptible individuals.

Conclusions:

  • Neural hyperexcitability is a key factor in migraine-related visual disturbances.
  • A comprehensive visual function examination is essential for migraine patients.
  • Identifying visual triggers can aid in migraine prevention and management.