Distance Suppression as a Predictive Factor in Progression of Intermittent Exotropia
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Purpose: To address the natural course of intermittent exotropia with small exodeviations (less than 20 prismdiopters [PD]) according to the status of suppression, and to evaluate whether suppression testing at the initialvisit can assist in predicting the progression of intermittent exotropia. Methods: Clinical records of patients at the Korea University Anam Hospital, Seoul, Korea diagnosed betweenJanuary 2014 and December 2018 with basic-type intermittent exotropia and initial distance deviations ofless than 20 PD, older than four years of age and a minimum of three follow-up visits within a 6-month spanwere retrospectively reviewed. The participants were divided into two groups, the suppression group and thenon-suppression group, based on the Vectogram results at the initial visit. Clinical characteristics, rate of surgery,and rate of progression were compared between the two groups. Results: A total of 71 patients were included. Among them, 16 patients (22.5%) had visual suppression at theinitial visit, while 55 patients (77.5%) had no suppression. At the initial visit, the mean distant angle of deviationwas 13.7 ± 3.2 PD (range, 4 to 18 PD) in the suppression group and 12.7 ± 3.4 PD (range, 10 to 18 PD) in thenon-suppression group. Ten patients (62.5%) underwent surgery in the suppression group and 12 patients(21.8%) underwent surgery in the non-suppression group (p < 0.01). Eleven patients (68.8%) in the suppressiongroup and 13 (23.6%) in the non-suppression group developed progression (p < 0.01). Conclusions: Suppression testing was important to predict the progression of intermittent exotropia, in patientswith exodeviation angles less than 20 PD at the initial visit.
Abstract
Purpose: To address the natural course of intermittent exotropia with small exodeviations (less than 20 prismdiopters [PD]) according to the status of suppression, and to evaluate whether suppression testing at the initialvisit can assist in predicting the progression of intermittent exotropia. Methods: Clinical records of patients at the Korea University Anam Hospital, Seoul, Korea diagnosed betweenJanuary 2014 and December 2018 with basic-type intermittent exotropia and initial distance deviations ofless than 20 PD, older than four years of age and a minimum of three follow-up visits within a 6-month spanwere retrospectively reviewed. The participants were divided into two groups, the suppression group and thenon-suppression group, based on the Vectogram results at the initial visit. Clinical characteristics, rate of surgery,and rate of progression were compared between the two groups. Results: A total of 71 patients were included. Among them, 16 patients (22.5%) had visual suppression at theinitial visit, while 55 patients (77.5%) had no suppression. At the initial visit, the mean distant angle of deviationwas 13.7 ± 3.2 PD (range, 4 to 18 PD) in the suppression group and 12.7 ± 3.4 PD (range, 10 to 18 PD) in thenon-suppression group. Ten patients (62.5%) underwent surgery in the suppression group and 12 patients(21.8%) underwent surgery in the non-suppression group (p < 0.01). Eleven patients (68.8%) in the suppressiongroup and 13 (23.6%) in the non-suppression group developed progression (p < 0.01). Conclusions: Suppression testing was important to predict the progression of intermittent exotropia, in patientswith exodeviation angles less than 20 PD at the initial visit.
참고문헌 (15)
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