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Determining the Contribution of Retinotopic Discrimination to Localization Performance With a Suprachoroidal Retinal

Matthew A Petoe1, Chris D McCarthy2, Mohit N Shivdasani1

  • 1Bionics Institute of Australia, East Melbourne, Victoria, Australia 2Department of Medical Bionics, University of Melbourne, Parkville, Victoria, Australia.

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Summary

Retinotopic discrimination with suprachoroidal retinal implants is possible. This study suggests that comparing retinotopic and nonretinotopic mapping can identify visual rehabilitation needs for improved performance.

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Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Neuroscience

Background:

  • Retinal prostheses offer a potential solution for vision loss in conditions like retinitis pigmentosa.
  • Effective use relies on integrating visual input from electrodes with head-directed localization.

Purpose of the Study:

  • To investigate the role of retinotopic electrode discrimination in visual task performance for suprachoroidal retinal implant recipients.
  • To assess if retinotopic mapping proficiency influences head movement and localization accuracy.

Main Methods:

  • Three participants with retinitis pigmentosa used a 24-channel suprachoroidal retinal implant.
  • Localization and grating acuity tasks were performed comparing retinotopic and nonretinotopic electrode mapping.

Main Results:

  • One participant showed impaired localization and increased head movements with nonretinotopic mapping.
  • The other two participants did not show significant differences between mapping conditions.

Conclusions:

  • Retinotopic discrimination is achievable with suprachoroidal retinal prostheses.
  • Nonretinotopic mapping can alter head movement strategies, potentially revealing deficits in retinotopic discrimination for targeted rehabilitation.