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Vergence orthoptics: validity and persistence of the training effect
J D Grisham1, M C Bowman, L A Owyang
1School of Optometry, University of California, Berkeley.
Summary
Orthoptic treatment for vergence deficiencies is valid and permanent. Vergence training improved both subjective and objective measures, with lasting effects observed in most patients.
Area of Science:
- Ophthalmology
- Vision Science
- Orthoptics
Background:
- Orthoptic treatment for vergence deficiencies often relies on subjective measures of success.
- Objective indices are needed to validate treatment efficacy and permanence.
Purpose of the Study:
- To investigate the relationship between subjective Risley prism vergences and objective vergence tracking rate.
- To assess the validity and permanence of orthoptic treatment for vergence deficiencies.
Main Methods:
- Compared vergence tracking rate and Risley prism vergences in vergence-deficient subjects and trained individuals.
- Monitored the persistence of training effects for up to 9 months.
Main Results:
- Vergence-deficient control subjects showed no significant changes.
- Trained subjects demonstrated rapid improvements in both subjective and objective vergence measures.
- No regression was observed in subjects meeting release criteria; one early-terminating subject showed regression.
Conclusions:
- Vergence training is a valid and effective treatment for vergence deficiencies.
- The observed improvements are likely permanent in compliant patients, supporting previous clinical findings.