Journal article
Reliability of step vergence method for assessing fusional vergence in intermittent exotropia
Ophthalmic & physiological optics, v 42(4), pp 913-920
Jul 2022
PMID: 35243666
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Purpose
To evaluate the reliability of the step vergence method in measuring fusional vergence in subjects with intermittent exotropia.
Methods
Thirty‐two Chinese participants aged 7–20 years with intermittent exotropia (excluding the convergence insufficiency type) were enrolled in this prospective study. At the eligibility screening, visual acuity, cover test and the Office Control Score were performed. For eligible participants at study visit 1, negative and positive fusional vergence at distance and near, eye dominance and the fusion maintenance test were performed. All eligible participants returned for study visit 2 on the same day (2–4 h later), and the testing was repeated. The primary outcome measures were the intra‐class correlation coefficient, coefficient of repeatability and smallest detectable change in the break and recovery points of negative and positive fusional vergence between the two study visits.
Results
The intra‐class correlation coefficient for different vergence parameters ranged from 0.64 to 0.87. The coefficient of repeatability and the smallest detectable change for the distance positive fusional vergence break point were ±20.5 and 13.1 ∆, respectively. There was no significant difference in any vergence parameter between the first and second visits. The coefficient of repeatability and the smallest detectable change in all distance vergence parameters were high when compared to the mean value. The association between distance vergence parameters and the Office Control Score was significant only when including subjects who failed to fuse at the beginning of the test.
Conclusion
The data demonstrate that measurement of fusional vergence with a prism bar has low repeatability in subjects with intermittent exotropia. In these individuals, convergence ability at distance is compromised, whereas other vergence parameters are not adversely affected. While the step vergence method is a valuable test in daily practice, caution is warranted when using it in clinical research.
Metrics
Details
- Title
- Reliability of step vergence method for assessing fusional vergence in intermittent exotropia
- Creators
- Martin Ming‐Leung Ma - Sun Yat‐sen UniversityYing Kang - Sun Yat‐sen UniversityMitchell Scheiman - Salus UniversityQiwen Chen - Sun Yat-sen UniversityXuelian Ye - Sun Yat-sen UniversityXiang Chen - Sun Yat-sen University
- Publication Details
- Ophthalmic & physiological optics, v 42(4), pp 913-920
- Publisher
- Wiley
- Number of pages
- 8
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Pennsylvania College of Optometry (PCO)
- Web of Science ID
- WOS:000763893600001
- Scopus ID
- 2-s2.0-85125589767
- Other Identifier
- 991021900020704721
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- Collaboration types
- International collaboration
- Web of Science research areas
- Ophthalmology