Logo image
Back
Objective Assessment of Intermittent Exotropia Magnitude and Control Using the Binocular Eye Alignment Monitor
Journal article   Open access   Peer reviewed

Objective Assessment of Intermittent Exotropia Magnitude and Control Using the Binocular Eye Alignment Monitor

Erin Jenewein, Christopher J Morris, Mitchell Scheiman and Tara L. Alvarez
Ophthalmic and physiological optics, Forthcoming
03 Sep 2026
DOI: https://doi.org/10.1007/s44402-026-00179-0
PMID: 42693327
Featured in Collection :   Drexel's Newest Publications
url
https://doi.org/10.1007/s44402-026-00179-0View
Published, Version of Record (VoR) Open Access via Drexel Libraries Read and Publish Program 2026 Open CC BY V4.0

Abstract

Eye movement recording Intermittent exotropia Intermittent exotropia control Objective eye movements
Purpose To compare an objective assessment of intermittent exotropia (IXT) control and deviation size using the binocular eye alignment monitor (BEAM) to standard clinical assessments. Methods IXT control and deviation size were evaluated in 15 participants aged 8–35 years. Participants completed two visits that included a 90-min BEAM eye movement recording at a distance (6 m) to evaluate distance IXT size and control of the deviation objectively. IXT control was assessed using the mean of three measurements of the IXT Office Control Scale, and the deviation size was measured with the prism alternate cover test (PACT). Results The mean IXT control score in the IXT participants was 2.2 ± 1 points, which was weakly correlated with the percentage of time strabismic as measured by the BEAM (Spearman’s correlation coefficient = 0.29; p = 0.30). Distance PACT and mean BEAM deviation size demonstrated a moderate, non-significant association (ρ = 0.47, p = 0.08). BEAM measurements were consistently smaller than PACT measurements. IXT distance control (0.44; 95% CI: 0.04–0.80; p = 0.03) and the median deviation size measured by the BEAM (z = −2.1, p = 0.03) were significantly different between visits 1 and 2 (z = −2.1, p = 0.03); however, the percentage of time deviated (BEAM) was not significantly different between the two study visits (z = −0.63; p = 0.50). Conclusions The notable differences in control observed with the BEAM compared to current clinical measures suggest that office control scores and prolonged objective monitoring may capture different aspects of IXT control. Objective monitoring over extended periods may be a valuable complement to traditional clinical assessment in both research and clinical care.

Metrics

4 Record Views

Details

Logo image