IXT control vs. binocular summation
Reviewed by Fiona Rowe

The purpose of this study was to evaluate the relationship of BS scores with other current markers used for evaluating the control in preoperative intermittent exotropia (IXT) patients. Data was collected on stereoacuity, angle of deviation, Newcastle control score (NCS), high and low contrast visual acuity for 34 patients (18 female) with a mean age of 19±16 years. Mean age at onset of IXT was 6.9±7.2 years. Distance angle was 26±16PD with a mean near angle of 20±16PD. Mean BS at 2.5% and 1.25% low contrast visual acuity charts were significantly different between patients with low and high NCS groups. Mean BS at high contrast was not significantly different for NCS groups or for distance-near stereoacuity disparity groups. The authors report a positive relationship between IXT control and BS in the overall IXT patients but without consistent directly related difference at the level of the individual patient.

Binocular summation and control of intermittent exotropia.
Yulek F, Velez FG, Isenberg SJ, et al.
STRABISMUS
2017;25:81-6.