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Estimating Phosphene Locations Using Eye Movements of Suprachoroidal Retinal Prosthesis Users.

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Gaze-based phosphene mapping using eye movements is a viable alternative to finger-based mapping for retinal implants. This method accurately maps phosphene locations in some individuals, aiding visual prosthesis spatial encoding.

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Area of Science:

  • Biomedical Engineering
  • Neuroscience
  • Ophthalmology

Background:

  • Accurate spatial encoding is crucial for visual prostheses to restore vision.
  • Phosphene mapping, identifying perceived light locations, is essential for calibrating these devices.
  • Current methods, like finger-based mapping, can be time-consuming and subjective.

Purpose of the Study:

  • To demonstrate and evaluate phosphene mapping using eye movements (gaze-based) for a retinal implant.
  • To compare gaze-based mapping with conventional finger-based mapping and retinotopic electrode positions.
  • To assess the accuracy and feasibility of gaze-based phosphene mapping in retinal prosthesis recipients.

Main Methods:

  • Three participants with suprachoroidal retinal implants participated in the study.
  • Phosphene locations were identified using both finger-based and gaze-based (eye movement) methods.
  • Procrustes analysis was used to compare measured phosphene locations with expected retinotopic electrode positions.

Main Results:

  • Finger-based mapping showed spatial compression of phosphenes in all subjects but maintained retinotopic order.
  • Gaze-based mapping yielded results similar to expected locations in two out of three subjects.
  • One subject could not generate a coherent gaze-based map, potentially due to indistinct phosphenes.

Conclusions:

  • Gaze-based phosphene mapping is a feasible alternative to finger-based methods for retinal implants.
  • The effectiveness of gaze-based mapping varies among individuals, with some unable to produce coherent maps.
  • This technique shows promise for improving the calibration and spatial encoding capabilities of visual prostheses.