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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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Visual System01:26

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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.
Once through the pupil, the light passes through the lens, a...
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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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Color Vision01:24

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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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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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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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Related Experiment Video

Updated: Sep 15, 2025

Visualizing Visual Adaptation
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Lrrns define a visual circuit underlying brightness and contrast perception.

Elena Putti, Giulia Faini, Julie Thanh-Mai Dang

    Biorxiv : the Preprint Server for Biology
    |July 14, 2025
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified a visual circuit for brightness and contrast processing in zebrafish. Leucine-rich repeat neuronal (Lrrn) cell adhesion molecules (CAMs) are crucial for its assembly and function, impacting visual behaviors.

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    Area of Science:

    • Neuroscience
    • Vision Science
    • Molecular Biology

    Background:

    • Brightness and contrast are vital visual cues for survival behaviors like navigation and feeding.
    • Understanding the neural circuits and molecular mechanisms underlying visual processing is fundamental.

    Purpose of the Study:

    • To identify the visual circuit responsible for brightness and contrast processing in zebrafish.
    • To investigate the role of Leucine-rich repeat neuronal (Lrrn) cell adhesion molecules (CAMs) in the assembly and function of this circuit.

    Main Methods:

    • Utilized zebrafish as a model organism.
    • Employed genetic targeting of Lrrn CAMs.
    • Performed ultrastructural circuit reconstruction.
    • Conducted functional imaging analysis.

    Main Results:

    • Identified a specific brightness- and contrast-processing circuit in the zebrafish visual system.
    • Demonstrated that Lrrn2 and Lrrn3a are essential for the precise axonal targeting and connectivity of retinal ganglion cells (RGCs) in the optic tectum.
    • Showed that genetic disruption of Lrrn CAMs leads to circuit disorganization, impaired contrast sensitivity, and deficits in visually guided behaviors.
    • Revealed the critical role of Lrrn CAMs in luminance processing through ultrastructural and functional analyses.

    Conclusions:

    • Defined a fundamental visual processing pathway in the zebrafish.
    • Established Lrrn CAMs as essential molecular regulators for the assembly of this visual circuit.
    • Highlighted the importance of Lrrn CAMs in visual perception and behavior.