2020 Volume 37 Issue 2 Pages 154-159
Purpose: To measure cyclofusion in healthy adults and patients with superior oblique palsy using the ORTe and synoptophore and compare the results obtained with the two devices.
Subjects and Methods: We examined 17 subjects (28.9±6.3 years old) in the control group and 17 patients (46.1±23.9 years old) in the superior oblique palsy group. Cyclofusion was evaluated in the primary, 15° upward, and 15° downward positions using the ORTe and synoptophore.
Results: In the control group, cyclofusion ranged from 9.6° to 10.2° with ORTe and from 13.6° to 14.4° with the synoptophore. In the superior oblique palsy group, cyclofusion ranged from 12.0° to 13.5° with ORTe and from 16.5° to 18.4° with the synoptophore. In the control group, ORTe showed significantly smaller cyclofusion in all directions, and in the superior oblique palsy group, ORTe showed significantly smaller cyclofusion in the primary and 15° upward positions. There was no significant difference between the two groups in the results obtained with either device.
Conclusion: ORTe helped evaluate cyclofusion with the same efficacy as the synoptophore. The reason for the small amount of cyclofusion was presumed to be the difference in the binocular separation method between the ORTe and synoptophore.
