The Effect of Centrally Aligned Image Acquisition on the Reproducibility of Optic Nerve Head Topographic Parameters obtained with Heidelberg Retina Tomograph

ABSTRACT

To compare the effect of centrally aligned image acquisitions with that of roughly centered image acquisitions on the reproducibility of topographic parameters obtained with the Heidelberg Retina Tomograph. three optic nerve head images were acquired sequentially by the rough centration of live image on the monitor, after then another three images sequentially by the central alignment in five healthy eyes of five subjects. For the centrally aligned image acquisitions, the contour of the frozen live optic nerve head image of each eye was copied into the transparent film. The images were acquired when the margin of live image fitted the contour line on the film. The reliability coefficients of the parameters ranged from 59.4% to 98.2% by the rough centration and 89.7% to 98.7% by the the central alignment. The results indicate that centrally aligned image acquisition provide highly reproducible topographic data of optic nerve head.