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Related Concept Videos

The Retina01:32

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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.
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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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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

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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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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.
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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: Mar 30, 2026

Cone-Enriched Cultures from the Retina of Chicken Embryos to Study Rod to Cone Cellular Interactions
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Why rods and cones?

T D Lamb1

  • 1Eccles Institute of Neuroscience, John Curtin School of Medical Research, The Australian National University, Canberra, Australian Capital Territory, Australia.

Eye (London, England)
|November 14, 2015
PubMed
Summary
This summary is machine-generated.

Rods, comprising 95% of retinal photoreceptors, enable reliable single-photon detection for scotopic vision. This study explores the evolutionary advantages and disadvantages of this rod-dominant system, including slow dark adaptation.

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Area of Science:

  • Vision science
  • Neuroscience
  • Evolutionary biology

Background:

  • Human vision predominantly uses cones (photopic system) in modern environments.
  • Cones constitute only 5% of retinal photoreceptors, while rods (scotopic system) comprise 95%.

Purpose of the Study:

  • Investigate the evolutionary reasons for the dominance of rods in the retina.
  • Analyze the advantages of rod-mediated single-photon detection.
  • Examine the drawbacks of the scotopic system, such as slow dark adaptation.

Main Methods:

  • Review of existing literature on photoreceptor function and evolution.
  • Analysis of the biophysical capabilities of rod and cone systems.
  • Comparative study of retinal evolution and eye development.

Main Results:

  • Rods are highly sensitive, capable of detecting single photons.
  • The retina possesses mechanisms to process these low-level signals effectively.
  • Scotopic vision offers advantages in dim light but suffers from slow dark adaptation.

Conclusions:

  • The high proportion of rods reflects an evolutionary adaptation for sensitive dim-light vision.
  • Understanding rod and cone systems is crucial for comprehending visual perception.
  • The evolution of photoreceptors and the eye is a complex, multi-stage process.