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Updated: Jan 20, 2026

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Use of diffusing filters for artificially reducing visual acuity when testing equipment and procedures.

Sven P Heinrich1,2, Isabell Strübin3

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Summary

New Luminit filters effectively reduce visual acuity in normal observers for ophthalmological testing. These filters degrade acuity while largely preserving contrast sensitivity, offering a better alternative to Bangerter occluders.

Keywords:
Artificial degradationBlurContrast sensitivityObserver methodOcclusionVisual acuity

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Area of Science:

  • Ophthalmology
  • Visual Science
  • Optometry

Background:

  • Evaluating ophthalmological devices requires controlled visual acuity reduction.
  • Simulating visual impairments in normal observers avoids challenges of recruiting patients with specific visual deficits.
  • Existing methods like blurring filters and Bangerter occluders have limitations, including spurious resolution and suboptimal performance.

Purpose of the Study:

  • To identify filters that primarily reduce visual acuity while minimally impacting contrast sensitivity for ophthalmological testing.
  • To evaluate alternative filters to Bangerter occluders for controlled visual acuity reduction in research.

Main Methods:

  • Screened multiple filters for potential use in reducing visual acuity.
  • Measured visual acuity and contrast sensitivity using the Freiburg Acuity and Contrast Test with selected filters (Luminit LSD 0.5° and 1°, LEE 420) and a Bangerter occluder.
  • Qualitatively assessed filter effects on visual evoked potential (VEP) responses.

Main Results:

  • Luminit filters showed less participant variability in acuity compared to LEE and Bangerter filters.
  • The Luminit 0.5° filter minimally affected contrast sensitivity.
  • LEE and Bangerter filters caused greater variability and a more significant reduction in contrast sensitivity relative to acuity loss.
  • VEP results aligned with psychophysical findings.

Conclusions:

  • Luminit filters, with their Gaussian light diffusion, are suitable for artificially reducing visual acuity in research settings.
  • These filters offer a controlled method for simulating reduced acuity in ophthalmological studies.
  • Luminit filters provide a promising alternative for visual electrophysiology and device testing.