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Related Concept Videos

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,...
Association Areas of the Cortex01:21

Association Areas of the Cortex

Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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.
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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...
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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Related Experiment Video

Updated: May 11, 2026

Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration
10:14

Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration

Published on: May 26, 2023

The human fovea.

Joseph Carroll1, Aliya Siddiqui2, Joseph Kreis2

  • 1Department of Ophthalmology & Visual Sciences, Medical College of Wisconsin, Milwaukee, WI, United States; Department of Cell Biology, Neurobiology & Anatomy, Medical College of Wisconsin, Milwaukee, WI, United States.

Handbook of Clinical Neurology
|May 9, 2026
PubMed
Summary
This summary is machine-generated.

The fovea, crucial for high-acuity vision, has unique structures like specialized cone photoreceptors. Disruptions to this small retinal area can severely impact vision, as seen in various retinal disorders.

Keywords:
Avascular zoneCone photoreceptorFoveaRetinaRetinal imagingVisual acuity

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Related Experiment Videos

Last Updated: May 11, 2026

Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration
10:14

Ex Vivo OCT-Based Multimodal Imaging of Human Donor Eyes for Research into Age-Related Macular Degeneration

Published on: May 26, 2023

The Gateway to the Brain: Dissecting the Primate Eye
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Published on: May 27, 2009

Dissection of Human Retina and RPE-Choroid for Proteomic Analysis
06:54

Dissection of Human Retina and RPE-Choroid for Proteomic Analysis

Published on: November 12, 2017

Area of Science:

  • Ophthalmology
  • Retinal Science
  • Neuroscience

Background:

  • The fovea, despite its small size (0.1% of retinal area), is vital for sharp vision.
  • Its unique anatomy includes absent inner retinal layers, high cone density, and specialized midget ganglion cells.
  • Foveal structure is critical; even minor damage causes significant visual impairment.

Purpose of the Study:

  • To overview the basic anatomic specializations of the human fovea.
  • To define normal variations in foveal anatomy.
  • To describe foveal changes in developmental and degenerative retinal disorders using advanced imaging.

Main Methods:

  • Utilizing noninvasive in vivo imaging modalities.
  • Achieving resolution of individual cone photoreceptor cells.
  • Analyzing foveal structure in humans.

Main Results:

  • Detailed the unique anatomic specializations of the human fovea responsible for high-acuity vision.
  • Established the range of normal variation in foveal anatomy.
  • Illustrated foveal manifestations in conditions like albinism, premature birth, and achromatopsia.

Conclusions:

  • Foveal structure is paramount for visual function.
  • In vivo imaging advances allow detailed study of foveal anatomy and pathology.
  • Understanding normal and abnormal foveal anatomy aids in diagnosing and managing retinal disorders.