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Identifying Absolute Preferred Retinal Locations during Binocular Viewing.

Luminita Tarita-Nistor1, Moshe Eizenman, Natalie Landon-Brace

  • 1*PhD †MD Vision Science Research Program, Toronto Western Hospital, Toronto, Ontario, Canada (LT-N, ME, MJS, EGG); and Department of Biomedical Engineering (ME), Department of Ophthalmology and Vision Sciences (ME, SNM, MJS, EGG), and Division of Engineering Science (NL-B), University of Toronto, Toronto, Ontario, Canada.

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Summary
This summary is machine-generated.

This study introduces a new binocular eye-tracking method to find the absolute preferred retinal location (PRL) in both eyes of patients with central vision loss, aiding in visual function assessment.

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Engineering

Background:

  • Central vision loss significantly impacts daily activities.
  • Accurate localization of the preferred retinal location (PRL) is crucial for visual rehabilitation.
  • Existing methods for PRL determination can be complex and require calibration.

Purpose of the Study:

  • To develop and validate a novel binocular eye-tracking method for determining the absolute PRL in both eyes simultaneously.
  • To assess the PRL's location relative to the optic disc in patients with central vision loss.
  • To eliminate the need for user calibration in eye-tracking measurements.

Main Methods:

  • A binocular eye-tracking system was employed to measure pupillary axes.
  • A transformation was created between eye-tracking and microperimeter measurements using normal vision data.
  • This transformation was used to predict monocular and binocular PRL locations in patients with central vision loss.

Main Results:

  • The developed transformation method demonstrated low average errors for monocular PRL prediction (horizontal: 0.2°, vertical: 0.5°).
  • Predicted binocular PRLs generally showed corresponding locations in both eyes.
  • Functional retina was identified for at least one PRL in all participating patients during binocular viewing.

Conclusions:

  • Measurements of binocular PRLs relative to pupillary axes can be accurately transformed into absolute locations.
  • This non-calibrated, binocular eye-tracking approach offers a promising tool for assessing visual function in central vision loss.
  • The findings support the potential for improved visual rehabilitation strategies based on precise PRL localization.