Purpose: To determine the normative value of the physiologic excyclotorsion angle of the eye using fundus photos (the angle between horizontal line and the line relating fovea and the center of the optic disc), and to analyze the aging effect on this angle. Methods: 45 and 65 year-old subjects who underwent group glaucoma checkup sponsored by Ohta city government during three years (2013 to 2015) were investigated. Only those without ocular diseases who had good-quality fundus photographs taken were included. Results: 212 photographs of 39 (45 year-old) and 67 (65 year-old) subjects were analyzed. Physiologic excyclotorsion angle (average±standard deviation) was 6.2±2.9/6.8±2.8 degrees in the right eye and 7.1±3.6/7.8±3.2 degrees in the left eye in the 45/65 year-old groups, respectively. There was no statistical difference between the two groups (t-test. right eye, p=0.27; left eye, p=0.24). The angle of the left eye was statistically larger than of the right eye when the data of both groups were combined (paired t-test, p=0.025). Conclusions: The angle of the physiologic excyclotorsion determined by fundus photos does not differ between 45 and 65 year-old subjects. The angle of the left eye is larger than the right eye.
Purpose: To determine the normative value of the physiologic excyclotorsion angle of the eye using fundus photos (the angle between horizontal line and the line relating fovea and the center of the optic disc), and to analyze the aging effect on this angle. Methods: 45 and 65 year-old subjects who underwent group glaucoma checkup sponsored by Ohta city government during three years (2013 to 2015) were investigated. Only those without ocular diseases who had good-quality fundus photographs taken were included. Results: 212 photographs of 39 (45 year-old) and 67 (65 year-old) subjects were analyzed. Physiologic excyclotorsion angle (average±standard deviation) was 6.2±2.9/6.8±2.8 degrees in the right eye and 7.1±3.6/7.8±3.2 degrees in the left eye in the 45/65 year-old groups, respectively. There was no statistical difference between the two groups (t-test. right eye, p=0.27; left eye, p=0.24). The angle of the left eye was statistically larger than of the right eye when the data of both groups were combined (paired t-test, p=0.025). Conclusions: The angle of the physiologic excyclotorsion determined by fundus photos does not differ between 45 and 65 year-old subjects. The angle of the left eye is larger than the right eye.