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Related Concept Videos

Visual System01:26

Visual System

2.3K
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...
2.3K
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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What is a Sensory System?01:31

What is a Sensory System?

103.0K
Sensory systems detect stimuli—such as light and sound waves—and transduce them into neural signals that can be interpreted by the nervous system. In addition to external stimuli detected by the senses, some sensory systems detect internal stimuli—such as the proprioceptors in muscles and tendons that send feedback about limb position.
103.0K
Anatomy of the Eyeball01:20

Anatomy of the Eyeball

11.8K
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...
11.8K
Sensory Perception: Organization of the Somatosensory System01:11

Sensory Perception: Organization of the Somatosensory System

12.6K
The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
The receptor level:
The receptor level is the first stage of sensation. It involves the detection of a stimulus by specialized sensory receptors. The stimulus must arrive within the receptor's receptive field. Next, the receptor converts the energy of the...
12.6K
Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

11.1K
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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Related Experiment Video

Updated: Apr 5, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision
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Using Looming Visual Stimuli to Evaluate Mouse Vision

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Overview of the Visual System.

J Fielding Hejtmancik1, John M Nickerson2

  • 1Ophthalmic Genetics and Visual Function Branch, National Eye Institute, National Institutes of Health, Bethesda, Maryland, USA.

Progress in Molecular Biology and Translational Science
|August 28, 2015
PubMed
Summary
This summary is machine-generated.

This overview details the retina, covering its fundus, cellular layers, and the visual processing pathway. It explores the vitamin A cycle, neural connections, and retinal blood supply for a comprehensive understanding.

Keywords:
EyeGeneticsIntroductionVision

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Related Experiment Videos

Last Updated: Apr 5, 2026

Using Looming Visual Stimuli to Evaluate Mouse Vision
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Visualizing Visual Adaptation
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The Gateway to the Brain: Dissecting the Primate Eye
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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Cell Biology

Background:

  • The retina is a complex neural tissue responsible for converting light into neural signals.
  • Understanding retinal structure and function is crucial for diagnosing and treating vision disorders.

Purpose of the Study:

  • To provide a comprehensive overview of the retina's anatomy and physiology.
  • To cover key aspects including the fundus, retinal layers, cell types, and visual processing.

Main Methods:

  • Literature review and synthesis of existing research on retinal structure and function.
  • Detailed survey of the fundus, retinal layers, and cellular components.
  • Explanation of the visual transduction cascade and vitamin A cycle.
  • Analysis of retinal neuronal wiring and vascular supply.

Main Results:

  • The retina comprises distinct layers with specialized cell types, including photoreceptors, bipolar cells, and ganglion cells.
  • Visual transduction involves a cascade of molecular events initiated by light absorption in photoreceptors.
  • The vitamin A cycle is essential for photoreceptor pigment regeneration and continuous vision.
  • Complex neuronal circuitry underlies retinal information processing, with a dedicated blood supply ensuring metabolic support.

Conclusions:

  • This overview consolidates essential knowledge regarding the retina's structure, function, and unique biological processes.
  • A thorough understanding of these elements is fundamental for advancements in visual science and clinical ophthalmology.