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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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, whereas...
The Retina01:32

The Retina

The retina is a layer of nervous tissue at the back of the eye that transduces light into neural signals. This process, called phototransduction, is carried out by rod and cone photoreceptor cells in the back of the retina.
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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 layer, the vascular tunic,...
Vision01:24

Vision

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.
Color Vision01:24

Color Vision

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.
Visual System01:26

Visual System

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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Related Experiment Video

Updated: Jun 20, 2026

Transretinal ERG Recordings from Mouse Retina: Rod and Cone Photoresponses
08:38

Transretinal ERG Recordings from Mouse Retina: Rod and Cone Photoresponses

Published on: March 14, 2012

An alternative pathway mediates the mouse and human cone visual cycle.

Jin-Shan Wang1, Vladimir J Kefalov

  • 1Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, St. Louis, MO 63110, USA.

Current Biology : CB
|September 29, 2009
PubMed
Summary

Cone photoreceptors have a unique mechanism for rapid pigment regeneration and dark adaptation, essential for daytime vision. This pathway, independent of the pigment epithelium, is conserved across mammals, including humans.

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Last Updated: Jun 20, 2026

Transretinal ERG Recordings from Mouse Retina: Rod and Cone Photoresponses
08:38

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Published on: March 14, 2012

Imaging Ca2+ Dynamics in Cone Photoreceptor Axon Terminals of the Mouse Retina
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Published on: May 6, 2015

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05:07

Using Looming Visual Stimuli to Evaluate Mouse Vision

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Area of Science:

  • Visual neuroscience
  • Photoreceptor physiology
  • Biochemistry of vision

Background:

  • Cone photoreceptors require rapid pigment regeneration for continuous function in bright light.
  • The canonical visual cycle in the pigment epithelium has limitations for cone chromophore recycling.
  • Evidence suggests a cone-specific visual cycle in lower species, but its role in mammals is unclear.

Purpose of the Study:

  • To investigate the presence and function of a cone-specific visual cycle in mammalian retinas.
  • To determine if this pathway contributes to dark adaptation and dynamic range in cones.
  • To assess the evolutionary conservation of this cone-specific mechanism.

Main Methods:

  • Biochemical assays to measure pigment regeneration rates.
  • Physiological recordings of cone responses.
  • Comparative studies across mouse, primate, and human neural retinas.

Main Results:

  • Neural retinas of mice, primates, and humans exhibit cone-specific pigment regeneration and dark adaptation.
  • This pathway enhances the dynamic range of cones in background light, independent of the pigment epithelium.
  • The mechanism is crucial for daytime vision and appears evolutionarily conserved.

Conclusions:

  • Mammalian cones possess a distinct pathway for rapid pigment regeneration and dark adaptation.
  • This cone-specific visual cycle is vital for high-light visual function and is conserved across species.
  • The findings elucidate a key mechanism underlying human daytime vision.