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Related Experiment Videos

Vergence facility: establishing clinical utility

R Gall1, B Wick, H Bedell

  • 1College of Optometry, University of Houston, Texas.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|November 3, 1998
PubMed
Summary
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Vergence facility testing provides normative data for diagnosing binocular vision abnormalities. A specific flip prism (3 delta BI/12 delta BO) effectively differentiates between symptomatic and control groups, with good repeatability for near testing.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Vergence facility testing assesses the fusional vergence system's rapid response to changing demands.
  • Clinical use of vergence facility is limited by a lack of normative data.

Purpose of the Study:

  • To gather normative data for vergence facility testing.
  • To identify optimal parameters for differentiating symptomatic and control groups.

Main Methods:

  • Tested 20 symptomatic and 20 control subjects (ages 18-35).
  • Used 16 combinations of base-in/base-out flip prisms at 4.0m and 0.4m.
  • Assessed response over a 1-minute period.

Main Results:

  • Significant differences in horizontal vergence facility between symptomatic and control groups.

Related Experiment Videos

  • A 3 delta BI/12 delta BO prism optimally differentiated groups at distance and near.
  • Test-retest repeatability was poor at distance but good at near.

    • Conclusions:

    • Vergence facility testing provides valuable normative data.
    • The vergence system demonstrates adaptability across distances.
    • A near vergence facility test using a 3 delta BI/12 delta BO prism is clinically recommended for diagnosing binocular vision abnormalities.