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Field-wide Quantification of Aniseikonia Using Dichoptic Localization.

Kevin T Willeford, Marianna Butera1, Jeffrey LeBlanc1

  • 1Department of Biological and Vision Sciences, SUNY State College of Optometry, New York, New York.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 25, 2020
PubMed
Summary

This study introduces a new method to measure aniseikonia (unequal image magnification) across the entire visual field. Both local and global metrics effectively captured induced aniseikonia, but further development is needed for clinical use.

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Optometry

Background:

  • Aniseikonia measurement has a long clinical history, but field-wide analysis has been limited.
  • Existing methods struggle to integrate local visual field variations into global metrics.

Purpose of the Study:

  • To measure aniseikonia across the entire visual field using a novel paradigm.
  • To compare local and global metrics in capturing optically induced aniseikonia.

Main Methods:

  • Twelve participants performed dichoptic localization tasks at 24 visual field locations.
  • Four conditions included color filters and monocular lenses of varying sizes.
  • Local and global aniseikonia descriptors were computed from perceptual equality settings.

Main Results:

  • Optically induced aniseikonia showed predicted shifts in sign and magnitude at local and global levels.
  • Moderate intraobserver precision and systematic underestimations were observed.
  • Both local and global analyses captured changes in binocular spatial perception.

Conclusions:

  • Novel paradigm and mathematical approach validated for aniseikonia measurement.
  • Local and global metrics derived from dichoptic data capture induced aniseikonia.
  • Further research is required for clinical implementation in diagnostics and therapeutics.