Purpose: To compare the correlation of area cup-disc ratios (ACDR) measured by
the HRT and the Discam with visual field global indices in eyes with glaucoma.
Methods: Forty-eight eyes from 24 glaucoma patients
had optic disc images taken by the
HRT and the Discam. The mean deviation (MD) and corrected pattern standard
deviation (CPSD) from Humphrey Field Analyser were correlated (Pearson’s
correlation coefficient) with the ACDR of the HRT mean topography and Discam
stereo images. Two observers independently drew the disc margin on the HRT
images and the disc and cup margins on the Discam images produced two sets of
data.
Results: Images of 6 eyes were excluded because of
poor image quality. Forty-two eyes (29 POAG,13 NTG) were analysed. In both
observer's data, the HRT ACDR was significantly correlated with the MD
(p<0.001) and the CSPD (p<0.01). The Discam ACDR was significantly
correlated with the MD (p<0.05) but not with the CPSD. In POAG group, the
HRT ACDR was significantly correlated with the MD (p<0.01) and the CPSD
(p<0.05). In NTG group, the HRT ACDR was significantly correlated with the
MD (p<0.05) but not with the CPSD. There was no significant correlation
between the Discam ACDR and the MD or CPSD in both POAG and NTG subgroups.
Conclusion: In both subgroups of glaucoma there was
better correlation between the HRT ACDR and the MD and CPSD than with
the Discam ACDR. The HRT ACDR may be a better indicator of the degree of
glaucomatous optic nerve head damage.