The Comparison of Optic Disc Analysis between Heidelberg Retina Tomopgraph and Optical Coherence Tomography

ABSTRACT

PURPOSE: The purpose of this study was to evaluate whether there is the significant difference in the parameters associated with the optic nerve head between HRT and OCT. We also evaluated the influence of a tilted optic disc, temporal neural rim loss and peripapillary atrophy, in high myopia particularly. METHODS: Two hundred and sixty-eight eyes of 147 patients evaluated HRT and OCT disc analysis, were enrolled retrospectively to evaluate differences in common parameters (e.g., disc area, cup area, CD area ratio, rim area, and rim volume) among the two examination, using a paired t-test. RESULTS: Disc area, cup area and CD area ratio were greater when measured by OCT than HRT. Rim area and volume were smaller by OCT measures than by HRT. There was no difference in disc area and cup area of the high myopia group, but measures of CD area ratio were greater in OCT. Rim area and volume had higher measures in HRT of patients with high myopia. CONCLUSIONS: Because HRT and OCT analyze different optic nerve heads, the common parameters of HRT cannot be applied to OCT. In the high myopia group, tilted optic disc was not different between the two examinations, but OCT was superior in detecting the problem of temporal rim loss and an RPE margin that had been worrisome according to peripapillary atrophy was not a serious problem according to OCT.