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Related Concept Videos

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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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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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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Color Vision01:24

Color Vision

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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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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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Focusing of Light in the Eye01:16

Focusing of Light in the Eye

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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...
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Related Experiment Video

Updated: Nov 18, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss

Published on: April 11, 2025

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Restoring vision at the fovea.

Juliette E McGregor1

  • 1Center for Visual Science, University of Rochester, 601 Crittenden Blvd, Rochester, New York, USA.

Current Opinion in Behavioral Sciences
|February 8, 2021
PubMed
Summary

Restoring high-acuity vision requires focusing on the fovea, the eye's high-resolution center. Current vision restoration methods, often tested in non-foveal models, need to address foveal challenges for better patient outcomes.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Human high-acuity vision relies on the fovea, a specialized retinal region.
  • Current vision restoration strategies often use animal models lacking a fovea.
  • Approved electrical prostheses have not yet restored high-acuity vision.

Purpose of the Study:

  • To highlight the importance of the fovea in vision restoration research.
  • To evaluate the limitations of current and pre-clinical vision restoration approaches.
  • To propose a fovea-centric strategy for advancing vision restoration therapies.

Main Methods:

  • Review of current vision restoration strategies (electrical prostheses, cell therapy, optogenetics, chemical photosensitizers).
  • Analysis of challenges in reactivating inner retina and interpreting signals behaviorally.

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  • Comparative assessment of foveal versus non-foveal models in vision research.

    • Main Results:

    • Existing vision restoration methods face challenges in achieving high acuity.
    • Pre-clinical approaches require successful inner retinal reactivation and signal interpretation.
    • Animal models without foveae may not adequately represent human vision restoration needs.

    Conclusions:

    • Focusing research and development on the fovea is critical for achieving high-quality vision restoration.
    • Addressing foveal-specific challenges will accelerate progress in treating vision loss.
    • A paradigm shift towards fovea-centric approaches is needed for effective vision restoration therapies.