Effectiveness Of Binocular Vision Therapy In Managing Patients With Intermittent Exotropia

To understand the effect of Binocular Vision Training on Newcastle Control Score (Home) and enhancement in near stereopsis and convergence Amplitude in Intermittent Exotropia.

Krishna eye centre, Mumbai, India

This was a retrospective observational study of 21 subjects diagnosed with Intermittent Exotropia who underwent Binocular Vision Training with the BYNOCS® program. The Binocular Vision Training was divided into three phases (Phase1,2 and 3) spanned for 6 months. Frequency was reduced to once a week as a maintenance therapy. The vision training included Anti-suppression in the form of dichoptic therapy, exercises to enhance stereopsis and convergence. Evaluation of Newcastle Control Score (Home), Stereopsis, and Convergence Amplitude was conducted both before and after the training program.

Non–parametric statistical tests were applied for the data analysis. Median (IQR) age of the subjects was 12 years (7-19). Out of which 10 were female and 11 were male. Median change of Newcastle Control Score was 2 (1-2) to 0 (0-0) post Binocular Vision Training. Change in stereopsis was 150 sec of arc (100-200) to 30 sec of arc (20-50). Convergence break point was 14 Prism Diopter (2-20) which improved to 40 Prism Diopter (34-40), recovery point was 4 Prism Diopter (0-12) which improved to 40 Prism Diopter (32-40). Wilcoxan signed rank test showed significant improvement (p<0.001) in all aforementioned parameters.