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KMID : 1011420200250010089
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Journal of Korean Ophthalmic Optics Society
2020 Volume.25 No. 1 p.89 ~ p.97
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Six-month follow-up of Binocular Visual Function after Vision Therapyin Intermittent Exotropia with Three Types
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Lee Yang-Hoon
Kim Hyo-Jin
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Abstract
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Purpose: The aim of this study was to evaluate changes in exo-deviation and fusional vergence in intermittent exotropia with divergence excess (DE), basic exotropia, or convergence insufficiency (CI) after 6 months of vision therapy (VT), and investigate whether results of VT passed the criteria for functional treatment.
Methods: This study was conducted on 11 patients who had been diagnosed with intermittent exotropia at ophthalmic clinics and were aged between 5 and 28 years. All subjects visited the VT center once or twice a week for 6 months. Intermittent exotropia was classified into DE, basic exo, and CI, and the VT program was tailored to the type present. Assessments of binocular vision were performed using the cover test and positive fusional vergence (PFV) at far and near. Binocular visual function test results were recorded and compared at the first visit and 3 months and 6 months after VT for all subjects in general, and then according to the types of intermittent exotropia.
Results: Exo-deviation decreased from 16.4 PD to 11.6 PD at distance and from 20.1 PD to 13 PD at near after VT for 6 months in all subjects with intermittent exotropia. The average decreases in deviation were 29.2% and 35.3% at distance and near, respectively. PFV, given as break/recovery, increased from 10.6 PD/4.8 PD to 39 PD/33.6 PD at distance and 15.9 PD/9.6 PD to 41.8 PD/33.4 PD at near. All binocular vision results improved after the vision training in all three types of exotropia. There were no differences in improved results of binocular visual function after VT between the three types, and it met the expected values.
Conclusions: VT for 6 months resulted in decreased exo-deviation and increased positive fusional reserves in patients with intermittent exotropia of basic exo, divergence excess, or convergence insufficiency types. This met Sheard's criteria and passed the standard for functional care.
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KEYWORD
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Intermittent exotropia, Convergence insufficiency, Vision therapy, Vision training, Binocular vision
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