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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...
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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,...
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Channel Rhodopsins

Most organisms use photoreceptors to sense and respond to light. Examples of photoreceptors include bacteriorhodopsins and bacteriophytochromes in some bacteria, phytochromes in plants, and rhodopsins in the photoreceptor cells of the vertebral retina. The light-sensitive property of these receptors is because of the bound chromophores, such as bilin in the phytochromes and retinal in the rhodopsins.
Rhodopsins belong to the family of cell surface proteins called G-protein coupled receptors,...
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.

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Vibratome Sectioning Mouse Retina to Prepare Photoreceptor Cultures
11:22

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Published on: December 22, 2014

Mammalian inner retinal photoreception.

Robert J Lucas1

  • 1Faculty of Life Sciences, University of Manchester, Manchester, M13 9PT UK. robert.lucas@manchester.ac.uk

Current Biology : CB
|February 9, 2013
PubMed
Summary
This summary is machine-generated.

A decade ago, intrinsically photosensitive retinal ganglion cells (ipRGCs) were discovered, acting as autonomous photoreceptors. This finding revolutionized visual science, challenging previous understandings of light detection in the mammalian retina.

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Area of Science:

  • Ophthalmology and Visual Neuroscience
  • Cellular and Molecular Biology
  • Photobiology

Background:

  • A decade ago, the discovery of intrinsically photosensitive retinal ganglion cells (ipRGCs) challenged the established understanding of retinal function.
  • ipRGCs, a small subset of retinal ganglion cells, possess direct photoresponsiveness independent of rods and cones.
  • This discovery initiated a new field of study within visual science, focusing on non-canonical photoreception.

Purpose of the Study:

  • To provide historical context for the discovery of ipRGCs.
  • To review the advancements in the field of ipRGC research over the past ten years.
  • To explore potential practical applications stemming from the understanding of ipRGC function.

Main Methods:

  • Literature review and synthesis of research published over the last decade.
  • Analysis of studies demonstrating the autonomous photoreceptive capabilities of ipRGCs.
  • Examination of research exploring the physiological roles and potential therapeutic targets related to ipRGCs.

Main Results:

  • Established ipRGCs as autonomous photoreceptors, overturning the sole reliance on rods and cones for visual information.
  • Documented the significant growth and diversification of research into ipRGCs since their discovery.
  • Highlighted the emerging potential for practical applications in areas such as circadian rhythm regulation and ophthalmology.

Conclusions:

  • The discovery of ipRGCs represents a paradigm shift in visual neuroscience.
  • The field has rapidly evolved, revealing diverse functions and implications of these unique cells.
  • Future research holds promise for translating the understanding of ipRGCs into tangible clinical and technological advancements.