간헐외사시 환자에서 프리스비 데이비스 검사에 의한 술후 원거리 입체시

Distance Stereoacuity by Frisby Davis Distance Stereotest after Surgery in Intermittent Exotropic Patients

Purpose: To compare distance stereoacuity in patients with intermittent exotropia before and after surgery using the Frisby Davis distance stereotest (FD2), and to determine the preoperative factors that affect the postoperative distance stereoacuity. Methods: A total of 56 patients with intermittent exotropia were examined for the present study. To determine preoperative factors that affect postoperative distance stereoacuity, age, gender, distance control, and presence of fusion were measured. The deviation angle was measured at near and at distance by using a prism cover test. Distance stereoacuity was measured with the FD2 test. Results: According to the results of the FD2 test, the mean preoperative distance stereoacuity of patients was 64.7 ± 76.1 sec of arc, and improved to 53.6 ± 85.9 sec of arc postoperatively. The distance stereoacuity improved notably from 63.0 to 40.0 sec of arc after the successful surgery. No significant correlation was present between type of surgery, distance control, presence of fusion, and postoperative improvement of distance steroacuity. Conclusions: Decreased stereoacuity in intermittent exotropic patients improved postoperatively, and the FD2 test was valuable in evaluating the stereoacuity in intermittent exotropic patients pre- and postoperatively.