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A head mounted device stimulator for optogenetic retinal prosthesis.

Ahmed Soltan1, John Martin Barrett, Pleun Maaskant

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|August 30, 2018
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Summary

This study introduces a novel non-invasive headset using gallium nitride displays to stimulate optogenetic retinas, offering a potential vision restoration method for conditions like retinitis pigmentosa.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology

Background:

  • Optogenetic stimulation offers a promising avenue for vision restoration in retinal degenerative diseases.
  • Conventional virtual reality optics can be adapted for retinal stimulation.
  • Gallium nitride (GaN) displays provide high radiance suitable for biological applications.

Purpose of the Study:

  • To demonstrate the efficacy of compact high radiance gallium nitride displays with virtual reality optics for optogenetic retinal stimulation.
  • To introduce a non-invasive approach for vision restoration in conditions like retinitis pigmentosa.
  • To evaluate a system for stimulating remaining viable retinal communication pathways.

Main Methods:

  • Design and implementation of a headset featuring a high-density micro-LED matrix, Raspberry Pi, and virtual reality lenses.
  • Development of a test platform for evaluating headset and optical system performance.
  • Application of image simplification algorithms and in vivo evaluation of genetically modified retina response to varying light intensities.

Main Results:

  • The developed headset adheres to regulatory luminance limits (90 kcd m⁻²).
  • The optical system achieves 5.75% efficiency, delivering irradiance within regulatory limits (0.16 mW mm⁻²) and capable of higher peak irradiance (1.35 mW mm⁻²).
  • Efficacy was demonstrated through an optical model of an eye onto a biological retina, considering channelrhodopsin-2 stimulation thresholds.

Conclusions:

  • A fully functional 8100-pixel headset system, including software and hardware, was developed.
  • The system operates on a standard consumer battery for over 24 hours.
  • The headset effectively stimulates genetically modified retina cells while maintaining safety by staying below regulatory light thresholds.