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Modeling the Improved Visual Acuity Using Photodiode Based Retinal Implants Featuring Fractal Electrodes.

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Optimized fractal electrodes in retinal implants can stimulate more neurons at safe light levels, potentially restoring vision beyond the legal blindness threshold. This research advances subretinal implant technology for better visual acuity restoration.

Keywords:
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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology

Background:

  • Retinal implants offer a path to restoring vision in patients with severe retinal degenerations.
  • Current implants provide limited visual acuity (VA), often below the legal blindness level (< 20/200).
  • Optimizing electrode geometry is crucial for enhancing neural stimulation and visual function.

Purpose of the Study:

  • To optimize inner electrode geometry in photovoltaic subretinal implants.
  • To achieve a visual acuity (VA) better than the legal blindness level.
  • To investigate the efficacy of fractal versus square electrodes for neural stimulation.

Main Methods:

  • Simulated neural stimulation using 20 μm photovoltaic subretinal implants with square and fractal electrodes.
  • Calculated voltage generation based on light irradiance and photodiode input.
  • Mapped voltage spread in extracellular space and assessed neural stimulation thresholds.

Main Results:

  • Optimized fractal electrodes stimulated all neighboring neurons at 12 mW/mm² irradiance.
  • Optimized square electrodes stimulated only ~10% of neurons at the same irradiance.
  • Fractal electrodes theoretically enable VA up to 20/80, while square electrodes require ~300% higher irradiance.

Conclusions:

  • Fractal electrode geometry significantly enhances neural stimulation efficiency in subretinal implants.
  • Safe irradiance levels with fractal electrodes show potential for vision restoration exceeding the blindness level.
  • Further reduction of factors like glial scarring is needed to fully realize improved VA.