Topographic Measurements of the Optic Nerve Head with Confocal Scanning Laser Tomography in Normal Koreans

Seong, Gong Je; Chung, Gang Wook; Oh, Sung Taek

Abstract

In glaucoma, we need an accurate, highly reproducible analysis method for the purpose of early detection of fine glaucomatous optic nerve head change. Nowadays many investigations using confocal laser tomographic scanner (Heidelberg Retinal Tomograph ; HRT) are actively undertaken. We analyzed the optic nerve head of 479 normal eyes(male:308, female:171) with HRT, and got the mean value of each parameter in HRT. We compared the difference between men and women. We also observed the distribution of the value of each parameter in normal adult. In addition, for the parameter of rim/disc area ratio, we got the mean value in 6 divisions of optic nerve head. The range of distribution of disc area was from 1.139 mm2 to 4.512 mm2, cup area ranged from 0.104 mm2 to 2.667 mm2, and rim area was from 0.760 mm2 to 2.925 mm2. The parameter which showed difference between men and women was height variation contour. For rim/disc area ratio, the mean value of each 6 divisions were as follows: nasal inferior, 0.909; nasal, 0.908; nasal superior, 0.860; temporal inferior, 0.763; temporal 0.519; temporal superior 0.738. We can make good use of the normal parameters of HRT in Koreans for diagnosis and treatment of glaucoma.