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Related Concept Videos

Vision01:24

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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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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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Consider a component AB undergoing a linear motion. Along with a linear motion, point B also rotates around point A. To comprehend this complex movement, position vectors for both points A and B are established using a stationary reference frame.
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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.
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Related Experiment Video

Updated: Oct 22, 2025

Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing
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Author Spotlight: Assessment of Visual Acuity in Central Vision Loss Through Motion-Based Peripheral Vision Testing

Published on: February 23, 2024

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Retinal waves prime visual motion detection by simulating future optic flow.

Xinxin Ge1, Kathy Zhang1, Alexandra Gribizis1

  • 1Department of Neuroscience, Kavli Institute for Neuroscience, Yale University School of Medicine, New Haven, CT 06510, USA.

Science (New York, N.Y.)
|August 26, 2021
PubMed
Summary
This summary is machine-generated.

Before eyes open, spontaneous retinal waves in mice mimic optic flow, guiding visual circuit development. Disrupting this wave directionality impacts how neurons process visual motion, revealing how early activity shapes visual responses.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Visual System Development

Background:

  • Sensory experience is not required for the emergence of environmental response capabilities.
  • Spontaneous retinal activity refines retinotopy and eye-specific segregation in mammals before eye opening.
  • The role of this early retinal activity in developing higher-order visual responses is not well understood.

Purpose of the Study:

  • To investigate the role of spontaneous retinal waves in early visual processing.
  • To determine if the spatial propagation of retinal waves resembles optic flow patterns.
  • To examine how the directionality of these waves influences the development of direction-selective neurons.

Main Methods:

  • Analysis of spontaneous retinal wave propagation patterns in neonatal mouse models.
  • Genetic or pharmacological manipulation to disrupt wave directionality.
  • Electrophysiological recordings of superior colliculus neurons to assess response properties.

Main Results:

  • A specific developmental window was identified where retinal waves spatially propagate like optic flow.
  • The circuit components necessary for adult direction-selective retinal circuits are also required for wave directionality.
  • Chronic disruption of retinal wave directionality led to altered development of direction-selective responses in superior colliculus neurons.

Conclusions:

  • Developing visual systems utilize spontaneous activity patterns that simulate real-world stimuli like optic flow.
  • This self-generated activity instructs the self-organization of visual circuits, particularly for motion processing.
  • Early retinal wave directionality is crucial for establishing mature visual response properties.