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G Manni, D Olzi, G Cupo, M Centofanti, F Oddone, M Scipioni, MG Bucci; Correlation Between Morphologic Data of the Glaucomatous Optic Disc Obtained by HRT or Discam and Perimetric Data Obtained by Humphrey 24/2 . Invest. Ophthalmol. Vis. Sci. 2002;43(13):249.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To evaluate which technique, Heidelberg Retinal Tomography (HRT) or Discam, gives a cup/disc ratio that best correlates with the Mean Deviation (MD) and Corrected Pattern Standard Deviation (CPSD) of computerized perimetry. Methods: 30 patients affected with Open Angle Glaucoma (OAG) were enrolled for the study. The patients underwent computerized perimetry (Humphrey test 24/2), that provided the values of the MD and the CPSD. In the same session, the same operator obtained images of the optic disc both with HRT(Heidelberg Engineering) and Discam (Marcher Enterprises Ltd., Hereford), after having induced a 5-6mm mydriasis. The images obtained with HRT were analysed by the machine's software after the operator defined the contour of the optic disc (with a mouse). The images obtained with Discam were observed with a stereo viewer, defined by the operator with the mouse, and analysed by the machine's software. The morphometric parameter used for the study was the cup/disc ratio, measured on all 360° both with HRT and Discam. The perimetric parameters used for the study were the MD and CPSD. The data was analysed with a linear regression to correlate the cup/disc ratio derived from the two techniques with the MD and CPSD. Results: The mean cup/disc ratio obtained in OAG patients with HRT was 0,464 0,135. The mean cup/disc ratio obtained in OAG patients with Discam was 0,346 0,096. The linear regression analysis between cup/disc and MD revealed that the values obtained with HRT correlate much more significantly with the MD than those obtained with Discam (r=0,532; p<0,01 and r=0,082; p≷0,05 respectively), and HRT correlates much more significantly with CPSD (r=0,468; p<0,01) than does Discam (r=0,052 ; p≷0,05) Conclusion: Our results confirm the presence of a good correlation between values of cup/disc obtained with HRT and values of MD and CPSD of the perimetry, as already expressed by other authors1. On the other hand, the values of cup/disc measured by Discam show no correlation with the perimetric values, MD and CPSD. Thus, HRT seems to be better suited as a diagnostic tool to identify early glaucomatous damage. However, considering the lower cost of Discam with respect to HRT, it is worth evaluating the possible advantages of its use for the follow-up of the morphologic damage of glaucomatous patients.
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