Journal List > J Korean Ophthalmol Soc > v.58(9) > 1010638

Kim, Yeon, Ha, and Kim: Relationship between Early Postoperative Stereoacuity and Surgical Outcome in Intermittent Exotropia



To identify the correlation between early postoperative stereoacuity and surgical outcome in intermittent exotropia.


The medical records of 74 patients who underwent unilateral lateral rectus recession or bilateral lateral rectus recession for intermittent exotropia with a minimum postoperative follow-up of 3 years were retrospectively reviewed. Postoperative stereoacuity was measured using the vectogram test and Titmus test at 1 month post-operative. The deviation angle was measured at near and at distance using a prism cover test. Patients were divided into two groups according to post-operative angle deviation, and stereoacuity was analyzed in both groups.


Sixty patients showed no suppression at distance at 1 month post-operative follow-up. Of these, 55 patients (85.9%) belonged to the success group and 5 patients (50.0%) belonged to the recurrence group. The post-operative suppression test and the surgical outcome exhibited a significant association (p = 0.017). 53 patients showed normal stereoacuity 1 month after surgery. Of these, 49 patients (76.6%) belonged to the success group and 4 patients (40.0%) belonged to the recurrence group (p = 0.017). Post-operative stereoacuity and surgical outcome exhibited a significant association (p = 0.026).


Post-operative suppression test results at distance and stereoacuity at near may be helpful in predicting surgical outcomes of patients with intermittent exotropia.

Figures and Tables

Table 1

Baseline characteristics of total patients (n = 74)


Values are presented as mean ± SD unless otherwise indicated.

VA = visual acuity; PD = prism diopter; D = at distance; N = at near; OD = oculus dexter; OS = oculus sinister.

Table 2

Surgical outcome


ET = esotropia.

Table 3

Baseline characteristics and surgical outcomes of 1 week after operation between the 2 groups


Values are presented as mean ± SD unless otherwise indicated.

VA = visual acuity; PD = prism diopter; D = at distance; N = at near; OD = oculus dexter; OS = oculus sinister.

*Student t-test.

Table 4

Surgical outcomes of intermittent exotropia one month postoperative and 3 years postoperative


Values are presented as mean ± SD unless otherwise indicated.

PD = prism diopter; D = at distance; N = at near.

*Student t-test.

Table 5

Comparision of suppression confirmed by suppression at one month postoperative between 2 groups


*Fisher's exact test.

Table 6

Comparision of stereopsis by titmus test at one month postoperative between 2 groups


*Fisher's exact test; Normal stereopsis: ≤60 arc sec; Abnormal stereopsis: >60 arc sec.


This study was supported in part by Alumni of Department of Ophthalmology, Korea University in 2016.

Conflicts of Interest The authors have no conflicts to disclose.


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