|
목적 : To describe development of disc torsion and to analyze its potential influence on the axons in the optic nerve head.
방법 : 173 eyes of 173s Korean children with suspected optic disc who were assessed by serial disc photography at interval of 1 year or more. The angle of the vertical disc axis (AVDA) was measured on each fundus photographs with the fovea-disc center axis set at 0 degree. The associated morphologic change of the optic disc was assessed by measuring the ratio of the horizontal to vertical disc diameter (HVDR) and the ratio of the maximum parapapillary atrophy (PPA) width to vertical disc diameter (PVDR).
결과 : Mean subject age and refractive error at the time of baseline fundus examination were 6.8 ± 1.7 years (range, 2–11 years) and 0.2 ± 2.6 Diopters (range, -6.0–+8.5 Diopters), respectively. Mean follow-up period was 44.8 ± 21.1 months (range, 12–103 months). Forty-two eyes showed changes in the AVDA greater than intraobserver measurement variability (4.5 degree) during the follow-up period. AVDA change was associated with myopic shift, decrease of the HVDR and increase of PVDR.
결론 : Progressive optic disc torsion was a common phenomenon among children. The torsion mostly occurred as the result of optic disc tilt in oblique axis in most cases. Additional rotation of the optic disc axis found in the minority of subjects. The findings provide a platform to understand the torsion related glaucomatous optic nerve damage.
|