Y. Yamazaki et al., Influence of myopic disc shape on the diagnostic precision of the Heidelberg Retina Tomograph, JPN J OPHTH, 43(5), 1999, pp. 392-397
Purpose: To investigate the diagnostic capability of a glaucoma diagnostic
classification program for the Heidelberg Retina Tomograph (HRT) in eyes wi
th myopic disc shapes.
Methods: Sixty-six normal subjects (66 eyes) and 78 open-angle glaucoma pat
ients (78 eyes) were enrolled. The eves were divided into two groups; these
eyes with myopic and those with nonmyopic disc shapes. The classification
was based on clinical judgment made after the examination of stereophotogra
phs of the discs without considering the refractive errors. The agreement b
etween the classification program and the clinical diagnosis was evaluated
far sensitivity, specificity, and diagnostic precision. The influence of th
e disc shape on the HRT topographic parameters was evaluated.
Results: The sensitivity, specificity, and diagnostic precision of the HRT
were 83%, 95%, and 89% in eves with nonmyopic disc shapes, but 71%, 96%, an
d 53% in those with myopic disc shapes. Rim volume, height variation contou
r, mean retinal fiber nerve layer (RNFL) thickness, and RNFL cross-section
area were significantly larger in eyes with myopic disc shapes than in eyes
with nonmyopic discs, regardless of the clinical diagnosis.
Conclusions: The classification program should be modified to take into acc
ount the myopic disc shape in order to improve its capability to make more
accurate diagnosis of glaucoma possible. (C) 1999 Japanese Ophthalmological
Society.