The study was performed within the Affiliated Eye Hospital of Wenzhou Medical University. All participants were postoperative patients with IXT. The decision for undergoing surgery was determined by the surgeon, patient and patient’s parents. The criteria for surgery mainly includes a progressive increase in the angle of exotropia (exo-deviation ≥20 PD at near and distance), exotropia greater than or equal to 50% of waking hours [26 (link),27 (link)] or weaker control of exodeviation (office control score ≥3 at near or distance) [28 (link)], evidence of progressive loss of stereoacuity, or the appearance of the exotropia causing psychological problems of patients and parents (see Table S1 for detail). The inclusion criteria were: male or female patients aged 7 to 17 years old with basic-type IXT who received strabismus surgery one month prior and had a successfully corrected alignment (≤10 PD exodeviation or ortho when fixating at distance and near targets using PACT). The exclusion criteria included those with esophoria or complaints of diplopia, best-corrected visual acuity (BCVA) less than 20/25, anisometropia >1.50 diopter in spherical equivalent refraction (SER), or those with dysfunction of oblique muscle or oculomotor incoordination. More detailed eligibility criteria are described in this article [25 (link)].
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