Detecting suppression is important for monitoring change in and determining surgical timing for intermittent exotropia. Here, we evaluate the results of a prospective, cross-sectional study of the "polarized glasses dissociation test" for detection of suppression. A positive result was defined as constant deviation of one eye at 6 m when viewing at distance with polarized glasses. The sensitivity of the test for suppression as assessed using a vectograph was 100%, specificity 95%, positive predictive value 97% and negative predictive value 100%. Due to its simplicity and accuracy, the polarized glasses dissociation test could be an alternative to other suppression tests and can be applied to a wide range of age groups.