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Psychophysical Tests Do Not Identify Ocular Dominance Consistently.
Miguel A García-Pérez1, Eli Peli2
1Departamento de Metodología, Facultad de Psicología, Universidad Complutense, Madrid, Spain.
I-Perception
|May 10, 2019
Summary
Determining ocular dominance using psychophysical tests shows poor agreement between methods. Classical and newer tests often yield conflicting results, impacting clinical decisions.
Area of Science:
- Vision Science
- Ophthalmology
- Neuroscience
Background:
- Clinical practice relies on sensory tests to identify the dominant eye.
- Several psychophysical tests have emerged to quantify ocular dominance magnitude.
- The agreement between these psychophysical tests and classical methods remains uninvestigated.
Purpose of the Study:
- To assess the agreement between two common psychophysical tests (perceived-phase and coherence-threshold) for ocular dominance.
- To evaluate the concordance of these psychophysical tests with three classical clinical tests (Worth 4-dot, Randot suppression, Bagolini lenses).
- To investigate agreement using both conventional and more reliable psychophysical methodologies.
Main Methods:
- The perceived-phase test was used to measure cyclopean appearance of dichoptically presented sinusoids.
- The coherence-threshold test assessed interocular motion perception differences with dichoptic stimuli.
- Agreement was compared across psychophysical tests and classical methods (Worth 4-dot, Randot, Bagolini lenses).
Main Results:
- Weak correlations were found between psychophysical measures of dominance strength.
- Inconsistent identification of the dominant eye occurred across tests, with only 27.5% agreement.
- Classical tests also showed poor agreement with psychophysical classifications, including 35% opposite classifications.
Conclusions:
- Current psychophysical and classical tests for ocular dominance exhibit low agreement.
- Inconsistent results challenge reliable clinical determination of ocular dominance.
- Further research is needed to establish dependable methods for clinical decision-making regarding ocular dominance.
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