Very large-angle exotropia severely affects the patient’s binocular vision and appearance [1]. We tracked the results of very large-angle constant exotropia (≥120 PD) with only three muscles procedure for more than 5 years after surgery in order to evaluate the long-term efficacy.

This study was approved by Shanxi Province Eye Hospital Ethics Committee and followed up the tenets of the Declaration of Helsinki. Informed consent was obtained from all participants. 21 patients (10 males and 11 females) with constant exotropia (≥120 PD) were collected in Shanxi Province Eye Hospital in China from May 2011 to December 2013. Patients with paralytic strabismus, a history of prior strabismus surgery were excluded. All patients had best-corrected visual acuity 6/9 in each eye. The measurement method is the same as the one we used before [2]. The mean age at surgery was 33.57 years old (range 20–58, SD 9.69 years old). The mean preoperative exodeviation was 133.10 PD(SD 13.08 PD) at near and 131.67 PD (SD 12.78 PD) at distance. The mean follow-up period was 74.67 months (range 61–104, SD 12.61 months).

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