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From suppression to stereoacuity: a composite binocular function score for clinical research.

Ann L Webber1, Joanne M Wood1, Benjamin Thompson2

  • 1School of Optometry & Vision Science and Institute of Health & Biomedical Innovation, Queensland University of Technology, Brisbane, Australia.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 11, 2019
PubMed
Summary

A new binocular function (BF) score, derived from standard clinical tests, accurately measures binocularity in adults and children with strabismus or amblyopia. This validated score is useful for clinical trials, especially when stereoacuity is minimal.

Keywords:
binocular visionsimultaneous perceptionstereoacuitysuppression

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Area of Science:

  • Ophthalmology
  • Vision Science
  • Clinical Research

Background:

  • Assessing binocular vision, particularly stereoacuity and suppression, is crucial for diagnosing and managing conditions like strabismus and amblyopia.
  • Existing clinical measures may not fully capture the nuances of binocular function, especially in individuals with significant visual impairments.

Purpose of the Study:

  • To validate a composite binocular function (BF) score against laboratory-based dichoptic tests.
  • To assess the utility of the BF score in a cohort of adults and children with abnormal binocular vision.

Main Methods:

  • Developed a composite binocular function (BF) score using clinical stereoacuity tests (Randot Preschool Stereoacuity Test, Randot Butterfly) and the Worth 4 Dot test.
  • Measured threshold stereoacuity and depth of suppression using computerised dichoptic psychophysical tests in adults and children with strabismus or amblyopia.

Main Results:

  • The BF score was successfully assigned to all participants.
  • In adults, the BF score showed a high correlation with psychophysical threshold stereoacuity (ρ=0.71, p<0.001).
  • Both adults and children exhibited a strong correlation between the BF score and inter-ocular contrast balance (adults ρ=0.90, children ρ=0.86, p<0.001).

Conclusions:

  • The composite BF score is a valid and convenient measure of binocularity.
  • The BF score can extend stereoacuity measurements in populations with minimal or absent stereoacuity.
  • The BF score is a potential outcome measure for clinical trials evaluating binocular vision.