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Objective testing of vergence ranges

M D Wesson1, L C Masin, S T Boyles

  • 1School of Optometry, University of Alabama at Birmingham 35294, USA.

Journal of the American Optometric Association
|June 1, 1995
PubMed
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Objective vergence testing using a new prism bar technique provides results comparable to subjective methods in adults. A non-luminous target is recommended for more consistent vergence range measurements.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Vergence range testing is crucial for assessing binocular vision.
  • Current methods are challenging for non-verbal patients.
  • A novel objective prism bar technique is investigated.

Purpose of the Study:

  • To evaluate an objective prism bar technique for measuring vergence ranges.
  • To compare objective measurements with subjective vergence ranges.
  • To assess the efficacy of different targets for objective vergence testing.

Main Methods:

  • Two experiments were conducted on adult subjects.
  • Experiment 1: Compared subjective and objective vergence ranges using a non-luminous target.
  • Experiment 2: Compared self-illuminated and non-luminous targets for objective and subjective measurements.

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Main Results:

  • Objective and subjective vergence ranges showed favorable comparisons in adults.
  • A non-luminous target yielded more consistent results than a self-illuminated target (transilluminator).
  • The transilluminator showed greater variance and statistically different results for one measure.

Conclusions:

  • Objective vergence range measurements are comparable to subjective methods in adults.
  • Non-luminous targets are preferred for consistent objective vergence testing.
  • Self-illuminated targets may introduce accommodative influences affecting results.