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Related Concept Videos

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.
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.
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,...
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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Related Experiment Video

Updated: Jun 8, 2026

Horizontal Slice Preparation of the Retina
10:45

Horizontal Slice Preparation of the Retina

Published on: November 19, 2006

Multiple optic fiber patterns in the catfish retina.

B L Frank, S Goldberg

    Investigative Ophthalmology & Visual Science
    |October 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Catfish retinas can have multiple optic discs, with up to 50 observed in one retina. These optic discs appear in various patterns, including paired, unpaired, slit, and ring-like arrangements.

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    Area of Science:

    • Comparative anatomy
    • Ophthalmology
    • Ichthyology

    Background:

    • The structure of vertebrate retinas typically includes a single optic disc.
    • Variations in retinal anatomy can provide insights into evolutionary adaptations.

    Purpose of the Study:

    • To investigate and describe the patterns of optic nerve fibers and optic discs in catfish retinas.
    • To document the occurrence and arrangement of multiple optic discs in various catfish species.

    Main Methods:

    • Examination of silver-stained flat mounts of retinas from 11 different catfish families.
    • Detailed observation and cataloging of optic disc numbers, combinations, and spatial arrangements.

    Main Results:

    • Multiple optic discs were identified in the retinas of the studied catfish.
    • As many as 50 optic discs were found in a single retina.
    • Optic discs appeared in paired and unpaired combinations, as well as in slit and ring-like arrays.

    Conclusions:

    • Certain catfish species exhibit a unique retinal anatomy with multiple optic discs.
    • The observed patterns suggest diverse adaptations in visual processing among catfish.
    • Further research is warranted to understand the functional implications of multiple optic discs in catfish vision.