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Minimizing Iridium Oxide Electrodes for High Visual Acuity Subretinal Stimulation.

Samir Damle1, Maya Carleton2, Theodoros Kapogianis2

  • 1Department of Bioengineering, University of California San Diego, La Jolla, CA 92093.

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|November 20, 2021
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Summary

Smaller electrodes for retinal prosthetics have lower stimulation thresholds but larger ones improve vision restoration. This research optimizes electrode size for better outcomes in treating blindness.

Keywords:
blindnesselectrical stimulationneural stimulationprostheticretinaretinal prosthetic

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology

Background:

  • Age-related macular degeneration and other retinal diseases cause irreversible blindness.
  • Retinal prosthetics aim to restore vision by electrically stimulating the retina.
  • Reducing electrode size is crucial for high-resolution prosthetics but impacts stimulation efficacy.

Purpose of the Study:

  • To evaluate the stimulation efficacy of different sized iridium oxide electrodes for retinal prosthetics.
  • To determine the impact of electrode size on charge threshold and dynamic range within safe limits.
  • To identify optimal electrode parameters for high visual acuity retinal prostheses.

Main Methods:

  • Measuring retinal ganglion cell (RGC) responses in a mouse model of blindness.
  • Using 10, 20, and 30 μm diameter iridium oxide electrodes.
  • Assessing stimulation thresholds and dynamic range within electrode charge injection limits.

Main Results:

  • Smaller electrodes (10 μm) exhibited lower stimulation thresholds.
  • Larger electrodes (30 μm) achieved a greater dynamic range of neural responses.
  • Larger electrodes recruited more RGCs within safe charge injection limits.

Conclusions:

  • There is a practical lower limit for planar electrode size in retinal prosthetics.
  • Optimizing electrode size is key to maximizing both stimulation thresholds and dynamic range.
  • Findings guide the design of more effective retinal prostheses for vision restoration.