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Vergence facility and target type

R Gall1, B Wick, H Bedell

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

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|November 3, 1998
PubMed
Summary
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Vergence facility testing can use simple Snellen letters as a target, unlike accommodative facility testing which requires specific cues. This finding simplifies visual testing procedures.

Area of Science:

  • Optometry
  • Vision Science
  • Ophthalmology

Background:

  • Binocular accommodative facility response relies on target suppression-cues.
  • Recommendations for target types influencing vergence facility response are lacking.

Purpose of the Study:

  • To investigate the effect of different target types on vergence facility response.
  • To determine if specific target characteristics are necessary for valid vergence facility testing.

Main Methods:

  • Ten young subjects (16-19 years) with healthy vision and normal phorias were tested.
  • Vergence facility was measured over 1 minute using base-in and base-out prisms at near.
  • Three vertical targets were used: Snellen letters, anaglyphic shapes, and Wirt circles.

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Main Results:

  • Mean vergence facility response was comparable across all three target types (Snellen letters, anaglyphic shapes, Wirt circles).
  • Statistical analysis (one-way ANOVA) showed no significant difference in response between targets (p=0.97).

Conclusions:

  • Vergence facility testing does not require specialized targets with additional suppression-cues.
  • A simple vertical row of Snellen letters is sufficient for valid binocular vergence facility response.
  • This simplifies testing compared to accommodative facility which requires vectographic or anaglyphic cues.