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The FreiBurger: a new optotype for P300-based acuity estimation.

Céline Z Duval1, Saskia B Kaczan2, Sven P Heinrich2

  • 1Eye Center, Medical Center - University of Freiburg, Faculty of Medicine, Freiburg, Germany. celine.z.duval@gmail.com.

Documenta Ophthalmologica. Advances in Ophthalmology
|June 25, 2024
PubMed
Summary

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A new FreiBurger optotype reliably measures visual acuity using P300 event-related potentials in low-vision patients with visual field defects, unlike the standard Landolt C. This advances objective visual acuity assessment for challenging cases.

Area of Science:

  • Ophthalmology
  • Neuroscience
  • Visual Science

Background:

  • Objective visual acuity assessment is vital for suspected malingering or uncooperative patients.
  • Event-related potentials, specifically the P300 component, offer objective acuity measurement.
  • Standard optotypes like Landolt C are limited in low-vision patients with visual field defects.

Purpose of the Study:

  • Introduce a novel optotype, the FreiBurger, designed to overcome Landolt C limitations.
  • Evaluate the FreiBurger's efficacy in P300-based visual acuity assessment.
  • Test performance in simulated low vision and visual field constriction.

Main Methods:

  • Two experiments with 16 and 12 participants.
  • Psychophysical acuity estimates using FreiBurger and Landolt C.
Keywords:
Low visionObjective acuity estimationOptotypeVisual field defect

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  • P300 elicitation tested with undegraded vision, simulated low vision, and combined impairments.

    • Main Results:

    • Comparable psychophysical acuity values for both optotypes.
    • Similar P300 responses with undegraded and low vision.
    • FreiBurger reliably elicited P300 in combined low vision/constricted field; Landolt C failed.

    Conclusions:

    • The FreiBurger optotype expands P300-based acuity estimation to combined low vision and constricted visual fields.
    • This novel optotype overcomes limitations of the Landolt C in specific patient groups.
    • Expected benefits extend to time-sensitive psychophysical examinations.