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Using the Horseshoe Crab, Limulus Polyphemus, in Vision Research
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Effect of eccentric fixation on the steady-state pattern electroretinogram.

Evelyn B N Friedel1,2,3, Julia Haldina4, Kathrin Nickel5

  • 1Eye Center, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany. evelyn.friedel@uniklinik-freiburg.de.

Documenta Ophthalmologica. Advances in Ophthalmology
|February 28, 2024
PubMed
Summary

Moderate fixation inaccuracies minimally impact steady-state pattern electroretinogram (ssPERG) amplitude. However, large checks may elicit luminance responses, necessitating careful consideration in retinal ganglion cell function assessments.

Keywords:
EccentricityFixationMisfixationPERGPattern electroretinogramSteady-state PERG

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Psychophysics

Background:

  • The steady-state pattern electroretinogram (ssPERG) is crucial for evaluating retinal ganglion cell function.
  • Maintaining stable central fixation is a challenge in some patient and study populations.

Purpose of the Study:

  • To investigate the impact of fixation inaccuracies on ssPERG responses.
  • To determine how misfixation affects ssPERG to checkerboard stimuli.

Main Methods:

  • ssPERG responses were recorded with two check sizes (0.8°, 15°) and varying fixation deviations (0°-19° horizontal, 0°-14° diagonal).
  • Stimulus parameters included a 15° stimulus area and a 15/s reversal rate.

Main Results:

  • Fixation deviations up to ~7° showed minimal effect on ssPERG amplitude.
  • Nasal deviations had a greater impact than temporal deviations, especially with small checks.
  • Diagonal deviations, particularly with large checks, induced a luminance response at 7.5 Hz.

Conclusions:

  • Moderate fixation errors generally do not significantly alter ssPERG amplitude.
  • The potential for luminance responses with large checks must be accounted for during ssPERG analysis.