Normal Retinal Nerve Fiber Layer Thickness in the Peripapillary Region of Koreans Measured by Scanning Laser Polarimeter

ABSTRACT

PURPOSE: To measure normal retinal nerve fiber layer thickness (RNFLT) in the peripapillary region of Koreans using a scanning laser polarimeter, the nerve fiber analyzer (GDx VCC). METHODS: Two hundred ninety-nine eyes of 299 healthy subjects (156 men, 143 women) were recruited for this study. No subject had diabetes mellitus, hypertension, or any other neurologic disorders. All subjects were normal at ophthalmologic examination, which was assessed by slit-lamp biomicroscopy using a 90-diopter lens, Goldmann applanation tonometry, and Humphrey visual field analysis. Using the GDx VCC, we analyzed the mean value of each parameter in GDx VCC (average at global, superior, inferior, superior maximum and inferior maximum) and evaluated the difference between men and women and each decade of age. RESULTS: Mean RNFLT parameters in GDx VCC were global 56.42 +/- 6.84 micrometer, superior 70.51 +/- 8.70 micrometer, inferior 67.55 +/- 9.04 micrometer, superior maximum 83.52 +/- 12.38 micrometer, and inferior maximum 82.64 +/- 12.70 micrometer. The parameters which showed a difference between men and women were superior average and superior and inferior maximum average RNFLT. The superior RNFLT was thicker than the inferior ones. RNFLT was not statistically different in each decade of age. CONCLUSIONS: We can make good use of the normal parameters of GDx VCC in Koreans for early diagnosis and follow-up of glaucoma.