A comparison of tests for quantifying sensory eye dominance

Area of Science:

• Ophthalmology and Vision Science
• Neuroscience
• Psychophysics

Background:

• Clinicians commonly use stereoacuity to assess binocular vision, but it only captures one facet of binocularity.
• Current laboratory-based tests for sensory eye dominance (SED) are not widely adopted in clinical practice.
• There is a lack of consensus on the optimal method for measuring SED in clinical settings.

Purpose of the Study:

• To compare various methods for quantifying sensory eye dominance (SED) in a format suitable for clinical application.
• To evaluate the test-retest reliability and test-validity of different SED measurement techniques.
• To identify the most effective clinical measure of SED, comparing it against stereoacuity.

Main Methods:

• Thirty participants with normal vision were tested on eight different methods for quantifying SED.
• Seven tests focused on determining an interocular balance-point (BP), including contrast-BP and binocular rivalry.
• A polarity judgment test using superimposed, opposite-contrast optotypes was identified as a key method.

Main Results:

• A contrast-polarity judgment test demonstrated the best preservation of inter-observer differences in contrast balance.
• This polarity judgment test also maintained good test-retest reliability, making it suitable for clinical use.
• Tests employing polarity-rivalrous stimuli generally yielded more reliable judgments than those without.

Conclusions:

• A reliable and valid clinical measure of sensory eye dominance (SED) can be rapidly obtained using a simple contrast-polarity judgment.
• This method, requiring approximately 20 trials, provides a practical approach to assessing binocular visual function.
• The findings suggest that contrast-polarity judgments are a promising tool for advancing the clinical assessment of binocular vision.