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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

9.7K
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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The Retina01:32

The Retina

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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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Anatomy of the Eyeball01:20

Anatomy of the Eyeball

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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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Unrenewable Cells00:50

Unrenewable Cells

3.0K
In humans, the photoreceptor cells of the eye and sensory hair cells of the ear lack stem cells. These cells are thus unrenewable and cannot be replaced when they are damaged or destroyed.
Photoreceptors
The retina is composed of several layers and contains specialized cells called photoreceptors. The photoreceptors (rods and cones) change their membrane potential when stimulated by light energy. There are two types of photoreceptors—rods and cones—which differ in the shape of...
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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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Photoreceptors and Plant Responses to Light02:00

Photoreceptors and Plant Responses to Light

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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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Related Experiment Video

Updated: Feb 27, 2026

Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings
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Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings

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Photoreception is not just for neurons.

Annalisa M VanHook1

  • 1Science Signaling, AAAS, Washington, DC 20005, USA.

Science Signaling
|June 29, 2017
PubMed
Summary

Mouse iris muscles directly detect light. This discovery reveals intrinsic photosensitivity within the eye

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Cell Biology

Background:

  • The iris contains muscles that control pupil size.
  • Light detection in the eye is primarily mediated by retinal photoreceptors.

Purpose of the Study:

  • To investigate potential intrinsic light sensitivity in the muscles of the mouse iris.

Main Methods:

  • Utilized electrophysiology and calcium imaging in isolated mouse iris muscle preparations.
  • Exposed tissues to controlled light stimuli of varying wavelengths and intensities.

Main Results:

  • Demonstrated that iris muscle cells exhibit a direct light-evoked electrical and calcium response.
  • Identified specific wavelengths of light that elicit the strongest responses in these muscles.

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Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo
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Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo

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Electrophysiological Characterization of GFP-Expressing Cell Populations in the Intact Retina
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Electrophysiological Characterization of GFP-Expressing Cell Populations in the Intact Retina

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Last Updated: Feb 27, 2026

Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings
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Determination of Photoreceptor Cell Spectral Sensitivity in an Insect Model from In Vivo Intracellular Recordings

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Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo
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Electrophysiological Method for Recording Intracellular Voltage Responses of Drosophila Photoreceptors and Interneurons to Light Stimuli In Vivo

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Electrophysiological Characterization of GFP-Expressing Cell Populations in the Intact Retina
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Electrophysiological Characterization of GFP-Expressing Cell Populations in the Intact Retina

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Conclusions:

  • Mouse iris muscles possess intrinsic photosensitivity, independent of retinal input.
  • This finding suggests a novel mechanism for light modulation of ocular structures.