J Korean Ophthalmol Soc > Volume 60(12); 2019 > Article
Journal of the Korean Ophthalmological Society 2019;60(12):1257-1262.
DOI: https://doi.org/10.3341/jkos.2019.60.12.1257    Published online December 15, 2019.
Outcomes of Augmented Surgery Performed after Simplified Prism Adaptation Testing in Patients with Intermittent Exotropia.
Mijeong Kim, Soochul Park
Saevit Eye Hospital, Goyang, Korea. psc1245@gmail.com
간헐외사시에서 단순화한 프리즘적응검사를 이용한 증량수술의 결과
김미정 · 박수철
Correspondence:  Soochul Park,
Email: psc1245@gmail.com
Received: 23 September 2019   • Revised: 18 October 2019   • Accepted: 6 December 2019
We explored whether the deviation angle in patients with intermittent exotropia was greater when the prism adaptation test was used rather than the prism cover test. METHODS: From January 2013 to December 2017, we performed the prism cover and adaptation tests on patients with intermittent exotropia. If the deviation angle increased by more than 5 PD after the prism adaptation test, surgery was performed. The outcomes of patients followed-up for more than 1 year after surgery were analyzed retrospectively. RESULTS: In total, 76 of 100 patients (76.0%) exhibited deviation angle increases of over 5 PD, the mean increase was 9.8 ± 6.3 prism diopters (PD) for near vision and 3.6 ± 3.5 PD for distance vision. Satisfactory motor alignment was achieved in 57 patients; 42 were undercorrected and 1 was overcorrected. The success rate was 62.5% in the non-responder group (n = 24, patients in whom the deviation angle did not increase after prism adaptation) and 68.9% in the full augmentation group (n = 45, in whom the deviation angle was increased). In the partial augmentation group (n = 31), where the surgical target was a 50% increase in the deviation angle, the success rate was lower than in the other groups. CONCLUSIONS: The preoperative prism adaptation test can be used to determine the angle of deviation and improves the surgical outcomes of patients with intermittent exotropia.
Key Words: Intermittent exotropia;Prism adaptation test;Surgery

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