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Observational Study
. 2025 Oct 1;73(10):1422-1425.
doi: 10.4103/IJO.IJO_724_25. Epub 2025 Sep 25.

Effectiveness of binocular vision therapy in managing patients with intermittent exotropia

Affan Ashfaque Ahmed Ansari  1 , Pradeep Sharma  2 , Erum W Khateeb  2 , Faiza Bhombal  1 , Shruti Lad  1 , Varsha Jain  1 , Areeba Usmani  3 , Antariksh Jain  3 , Md Oliullah Abdal  1
Affiliations
Free article
Observational Study

Effectiveness of binocular vision therapy in managing patients with intermittent exotropia

Affan Ashfaque Ahmed Ansari et al. Indian J Ophthalmol. .
Free article

Abstract

Purpose: Evaluating the effect of binocular vision training (BVT) on Newcastle Control Score (NCS)-Home, near stereopsis and convergence amplitudes in intermittent exotropia (IXT).

Design: Retrospective observational study.

Methods: 30 subjects diagnosed with IXT underwent online BVT with the BYNOCS® program. The BVT was divided into three phases (Phase 1, 2, and 3) for 20 sessions. The frequency was reduced to twice a week as a maintenance therapy. The vision training included antisuppression in the form of dichoptic therapy and exercises to enhance stereopsis and convergence. Evaluation of NCS-Home, Near Stereopsis, and convergence amplitude was conducted both before and after the training program.

Results: Nonparametric statistical tests were applied for the data analysis. The median age of the subjects was 14.5 years (10-22.75). Out of them, 13 were female and 17 male. The NCS-Home improved from 2 (1-3) to 0 (0-0) post BVT. The stereopsis changed from 1.48 log units (1.47-1.77) to 2.30 log units (2.07-2.47). The median convergence break point improved from 14 Prism Diopter, PD (4-20), to 38 PD (32-40). The median convergence recovery point improved from 6.25 PD (2-13.5) to 37 PD (30-40) post BVT. Wilcoxon signed-rank test showed significant improvement (P < 0.001) in all aforementioned parameters.

Conclusion: BVT for 20 online sessions is an effective method to improve control of IXT with improvement in NCS-Home, Near Stereopsis, and convergence amplitudes.

Keywords: Newcastle control score; intermittent exotropia (IXT); vision therapy.

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