Optic disc biomorphometry with the Heidelberg Retina Tomograph at different reference levels

Acta Ophthalmologica Scandinavica
K VihanninjokiP J Airaksinen

Abstract

The Heidelberg Retina Tomograph (HRT) is a confocal scanning laser tomograph that produces high resolution optical section images of the optic disc and central retina. Measurement accuracy and reproducibility is good. Several of the stereometric variables depend on the definition of a reference plane level. The purpose of the present study was to evaluate the four different reference levels in terms of their advantages and disadvantages in clinical work. Sixty-seven randomly chosen eyes belonging to 67 subjects were included in this study. Forty of the eyes were healthy and 27 had glaucoma. The HRT with software versions 1.09 and 1.11 was used to acquire and evaluate topographic measurements of the optic disc. Image analysis was performed at four different reference levels: 320 microm fixed offset reference level (REFd) (version 1.09), an individually determined reference level (REFi), a papillo-macular reference level (REFm) and a flexible reference level (REFf) (version 1.11). ANOVA was used to determine differences in the topographic parameters between the reference levels. In terms of the healthy eyes, all the variables using different reference levels give rather similar results. However, with advanced glaucoma the measure...Continue Reading

References

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Feb 20, 1998·Acta Ophthalmologica Scandinavica·K VihanninjokiP J Airaksinen
Jul 20, 2000·Graefe's Archive for Clinical and Experimental Ophthalmology = Albrecht Von Graefes Archiv Für Klinische Und Experimentelle Ophthalmologie·R O BurkJ M König

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Citations

Jan 27, 2005·Photomedicine and Laser Surgery
Dec 21, 2004·Acta Ophthalmologica Scandinavica·Munire Erman AkarYusuf Akar
Nov 19, 2013·Acta Ophthalmologica·Jost B JonasSonghomitra Panda-Jonas

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