Authors
Ma, Martin Ming-Leung BSc; Kang, Ying MD; Scheiman, Mitchell OD, PhD, FAAO; Chen, Xiang MS, PhD

Office-based Vergence and Accommodative Therapy for the Treatment of Intermittent Exotropia: A Pilot Study

publication date
September 21, 2019
Category
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Abstract/Introduction

SIGNIFICANCE 

This study will help to demonstrate the potential value of office-based vergence/accommodative therapy for the treatment of intermittent exotropia and provide data that can be used for planning future clinical trials.

 

PURPOSE 

This study was designed to evaluate changes in the office control score after office-based vergence/accommodative therapy for intermittent exotropia.

 

METHODS 

This was a prospective, unmasked pilot study. Fourteen Chinese participants aged 6 to 18 years with intermittent exotropia (excluding the convergence insufficiency type) were enrolled. All participants received 60 minutes of office-based vergence/accommodative therapy with home reinforcement once per week for 12 weeks. Therapy included vergence, accommodation, saccades and pursuits, antisuppression, and monocular fixation in binocular field techniques. The primary outcome measure was the change in the office control score from the baseline visit to the 13-week outcome visit.


Conclusion/Results

RESULTS 

All participants completed the study. The office control score at distance changed by −1.0 (95% confidence interval [CI] = −1.6 to −0.4; P = .005; Cohen's d effect size, 0.93). The distant Look And Cover, then Ten seconds Observation Scale for Exotropia score and distant Newcastle control score total score changed by −0.7 (95% CI, −1.2 to −0.2; P = .02; Cohen's d effect size, 0.55) and −1.9 (95% CI, −2.8 to −1.0; P < .001; Cohen's d effect size, 1.37), respectively. Although there was no significant change in the angle of distance exodeviation (−1.8 prism diopter [Δ] less exodeviation; 95% CI, −3.74 to 0.14Δ; P = .11), a significant change was observed in the near angle (−4.4Δ less exodeviation; 95% CI, −7.3 to −1.5Δ; P = .01; Cohen's d effect size, 0.79). There was no significant change in stereopsis or the Chinese Intermittent Exotropia Questionnaire score.

 

CONCLUSIONS 

In this select group of children with intermittent exotropia, 12 weeks of office-based vergence/accommodative therapy with home reinforcement resulted in a statistically and clinically significant improvement in the distance control of exodeviation and the near exodeviation magnitude. These results suggest that there is a need for a randomized clinical trial designed to determine the effectiveness of vision therapy as a treatment modality for intermittent exotropia.


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    Amanda T.

  • Vision Therapy is well worth the expense, time and effort. Our son had a hard time focusing handwriting neatly. After vision therapy Seth could complete a task in half the time it previously took his abilities to focus and improved greatly and so did his handwriting.

    Also, he was better at listening. As a parent you wanted learning to be fun for our son and vision therapy made this possible.


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    Dr. McBryar , Kristen and John  are all marvelous and we would recommend them to anyone I only wish that we would have found them sooner!


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  • Prior to coming to the institute for vision development my son complained of daily headaches. Therapy has eliminated his headaches completely. I love knowing my son is able to learn pain-free for the rest of his life because of the work that has been done over just a few weeks in this office. He he absolutely loved coming that didn't even feel like going to a doctor or therapy. We are grateful for the relief he was able to find by coming here.

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