J Korean Ophthalmol Soc.  2004 May;45(5):797-802.

Ocular Torsion in Normal Korean Population

• Lee DH
• Lee SJ
• Park SH

Abstract

PURPOSE
We determine the normal variation in cyclotorsion, the difference between the two eyes of each individual, and the torsional changes according to age and sex. METHODS: We examined the horizontal and vertical distances from the center of the disc to the fovea and the angle with fundus photographs of 100 ophthalmologically normal subjects (200 eyes). We calculated the vertical/horizontal disc ratio and the difference of the vertical disc-foveal distance and angle between the two eyes of each individual. We studied the changes of all the measured parameters according to age and sex. RESULTS: The horizontal distance from the center of the disc to the fovea was 2.62 +/- 0.25 DD in the right eye, 2.60 +/- 0.25 DD in the left eye, and the mean was 2.61 +/- 0.25 DD. The vertical distance from the center of the disc to the fovea was 0.28 +/- 0.15 DD in the right eye, 0.30 +/- 0.15 DD in the left, and the mean was 0.29 +/- 0.15 DD. The angle was 6.11 +/- 3.21degrees in the right eye, 6.67 +/- 3.18degrees in the left, and the mean was 6.39 +/- 3.20degrees. The difference of the vertical distance and the angle between the eyes was 0.13 +/- 0.09 DD and 2.98 +/- 2.07, respectively. The parameter change according to age and sex was not statistically significant (p>0.05). CONCLUSIONS: If the fovea was from 0.01 DD above center of the disc to 0.09 DD below the lower edge of the disc, we could confirm the absence of cyclotropia. There was no significant change of any of the measured parameters according to age and sex in the normal population.

Keyword

Fundus photographs; Ocular torsion