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Updated: Jun 18, 2026

Techniques for Processing Eyes Implanted With a Retinal Prosthesis for Localized Histopathological Analysis
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A comparison of retinal prosthesis electrode array substrate materials.

James D Weiland1, Mark S Humayun, Helmut Eckhardt

  • 1Doheny Eye Institute, Los Angeles, California, USA.

Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
|December 8, 2009
PubMed
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Restoring vision requires advanced artificial vision technology with many electrodes. This study evaluates polymers for creating new retinal prosthesis substrates to meet these demanding needs.

Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Materials Science

Background:

  • Restoring vision in outer retinal diseases necessitates advanced artificial vision systems.
  • Current neural stimulators are limited by a low number of electrode contacts (≤22).
  • High-density electrode arrays are critical for future high-acuity visual prostheses.

Purpose of the Study:

  • To evaluate suitable polymer substrates for high-density electrode arrays in retinal prostheses.
  • To address the technological gap in implantable neural stimulators for artificial vision.

Main Methods:

  • Evaluation of three polymer materials: polyimide, parylene, and silicone.
  • Assessment of polymers based on requirements for manufacturing, surgical integration, and biocompatibility.

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A Method for Systematic Electrochemical and Electrophysiological Evaluation of Neural Recording Electrodes
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Last Updated: Jun 18, 2026

Techniques for Processing Eyes Implanted With a Retinal Prosthesis for Localized Histopathological Analysis
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Published on: August 2, 2013

Techniques for Processing Eyes Implanted with a Retinal Prosthesis for Localized Histopathological Analysis: Part 2 Epiretinal Implants with Retinal Tacks
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A Method for Systematic Electrochemical and Electrophysiological Evaluation of Neural Recording Electrodes
09:27

A Method for Systematic Electrochemical and Electrophysiological Evaluation of Neural Recording Electrodes

Published on: March 3, 2014

Main Results:

  • Polymer evaluation for suitability as substrates in high-density electrode arrays.
  • Identification of potential materials for next-generation retinal prostheses.

Conclusions:

  • Advanced polymer substrates are essential for developing high-channel-count retinal prostheses.
  • The selection of appropriate materials is critical for the success of artificial vision implants.