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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,...

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Related Experiment Video

Updated: Jun 23, 2026

Techniques for Processing Eyes Implanted with a Retinal Prosthesis for Localized Histopathological Analysis: Part 2 Epiretinal Implants with Retinal Tacks
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Toward a wide-field retinal prosthesis.

Hossein Ameri1, Tanapat Ratanapakorn, Stefan Ufer

  • 1Doheny Retina Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA. amerih@hotmail.com

Journal of Neural Engineering
|May 22, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a wide field electrode array for retinal prostheses, potentially expanding the visual field from 10 to 34 degrees. This advancement may significantly improve mobility and visual function for patients with low vision.

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Last Updated: Jun 23, 2026

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Area of Science:

  • Biomedical Engineering
  • Ophthalmology
  • Neuroscience

Background:

  • Low vision, especially peripheral loss, impairs patient mobility.
  • A strong correlation exists between visual field size and mobility in low vision patients.
  • Current retinal prostheses offer a limited visual field (approx. 10 degrees).

Purpose of the Study:

  • To present a novel wide field electrode array for retinal prostheses.
  • To potentially increase the visual field of view for improved patient mobility.

Main Methods:

  • Design and fabrication of wide field electrode arrays (10 mm width).
  • Testing on a mechanical eye model to assess fixation and conformability.
  • Surgical feasibility study using enucleated porcine eyes.

Main Results:

  • The designed arrays could potentially provide a 34-degree visual field.
  • Arrays demonstrated successful fixation with a single retinal tack on a mechanical model.
  • Arrays conformed to the inner curvature of the eye.
  • Feasible implantation via a 5 mm incision in porcine eye models.

Conclusions:

  • Wide field electrode arrays show promise for significantly enhancing visual field in retinal prosthesis users.
  • This technology may lead to substantial improvements in mobility and visual function for patients with low vision.