Reliability of step vergence method for assessing fusional vergence in intermittent exotropia.
divergence excess
exotropia
fusional vergence
intermittent exotropia
step vergence
strabismus
Journal
Ophthalmic & physiological optics : the journal of the British College of Ophthalmic Opticians (Optometrists)
ISSN: 1475-1313
Titre abrégé: Ophthalmic Physiol Opt
Pays: England
ID NLM: 8208839
Informations de publication
Date de publication:
07 2022
07 2022
Historique:
revised:
09
02
2022
received:
08
12
2021
accepted:
09
02
2022
pubmed:
5
3
2022
medline:
9
6
2022
entrez:
4
3
2022
Statut:
ppublish
Résumé
To evaluate the reliability of the step vergence method in measuring fusional vergence in subjects with intermittent exotropia. 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. 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. 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.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
913-920Informations de copyright
© 2022 The Authors Ophthalmic and Physiological Optics © 2022 The College of Optometrists.
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