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Updated: Sep 13, 2025

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Dioptric blur is not fully reflected by VEP-based visual acuity estimates.

Dillys A D Amega1,2,3, Julia Haldina2,3, Ingrid Toews4,3

  • 1Department of Vision Science, School of Optometry and Vision Science, University of Cape Coast, Cape Coast, Ghana.

Documenta Ophthalmologica. Advances in Ophthalmology
|July 31, 2025
PubMed
Summary
This summary is machine-generated.

Visual evoked potentials (VEPs) accurately measure visual acuity (VA) with Gaussian blur but underestimate VA reduction from dioptric blur. This impacts accuracy in assessing refractive errors using VEP-based VA testing.

Keywords:
DefocusDioptric blurGaussian blurGrating acuitySpurious resolutionVisual acuityVisual evoked potentials

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Vision Science

Background:

  • Objective visual acuity (VA) estimation using visual evoked potentials (VEPs) is crucial when psychophysical VA is unreliable.
  • Refractive errors and accommodation issues can impact VA measurements, necessitating investigation into their effect on VEP-based VA.

Purpose of the Study:

  • To determine if VEP-based VA estimation reflects vision reduction caused by dioptric blur.
  • To compare VEP-based VA with psychophysical VA under different blur conditions (Gaussian vs. dioptric).

Main Methods:

  • Vision was degraded in 19 participants using plus lenses (dioptric blur) or a Gaussian blur filter.
  • VEP-based VA and psychophysical VA (Landolt-C and grating) were measured and compared for both blur types.

Main Results:

  • VEP-based VA closely matched psychophysical VA with Gaussian blur.
  • VEP-based VA overestimated psychophysical VA by 0.37 logMAR with dioptric blur.
  • Psychophysical grating VA showed mild blur effects, independent of blur type.

Conclusions:

  • VEP-based VA estimation does not fully capture vision reduction from dioptric blur.
  • This characteristic may reduce VEP susceptibility to refractive errors but limits accuracy in quantifying such impairments.