 2. deviation meeting all of the following criteria: A. intermittent or constant exotropia at distance mean of 3 baseline assessments of distance control or Grade 2 B. intermittent exotropia at near at least 1 of 3 assessments of near control at the baseline visit Grade 2-4 C. distance and near exodeviation both between 15 to 35 prism diopters PD measured by prism and alternate cover test PACT; D. near deviation not exceeding the distance deviation by 10PD by PACT i.e., convergence insufficiency type IXT excluded 