J Korean Ophthalmol Soc.  2005 Oct;46(10):1684-1689.

The Range of Ocular Torsion in Mass Screening

• Lee HJ
• Lim KH

Abstract

PURPOSE
To determine the range of cyclotorsion in the mass screening of patients by studying the spatial relationship between the optic disc and the fovea. METHODS: We examined the horizontal and vertical distances from the center of the optic disc to the fovea using the fundus photographs of 249 subjects (498 eyes) without a past history of strabismus through mass screening and then calculated the optic disc-foveal angle. We studied the differences in all the measured parameters between the right and left eyes and between men and women. RESULTS: The horizontal distance from the center of the optic disc to the fovea was 2.59+/-0.26 DD (disc diameter) in the right eye and 2.58+/-0.27 DD in the left eye. The mean horizontal distance was 2.59+/-0.26 DD. The vertical distance from the center of the optic disc to the fovea was 0.28+/-0.14 DD in the right eye and 0.30+/-0.13 DD in the left eye. The mean vertical distance was 0.29+/-0.14 DD. The calculated disc-foveal angle was 6.26+/-2.98 degrees in the right eye and 6.69+/-2.84 degrees in the left eye (mean, 6.50+/-2.92 degrees). There were no significant differences between the right and left eyes or between males and females. The 95% range of the location of the fovea was from 0.01 DD to 0.57 DD inferior to the optic disc center. CONCLUSIONS: We concluded that the clinical location of the fovea, as measured in the mass screening, extends from the center of the optic disc to the lower edge of the optic disc.

Keyword

Cyclotorsion; Fovea; Optic disc

MeSH Terms

Female
Humans
Male
Mass Screening*
Strabismus