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M. K. Klamann, A. Viestenz, C. K. Vorwerk, A. Langenbucher, W. Behrens-Baumann; Influence of Biometric Values on the Optic Nerve Head Planimetry Using HRT and OCT. Invest. Ophthalmol. Vis. Sci. 2008;49(13):3642.
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© ARVO (1962-2015); The Authors (2016-present)
To evaluate the optic nerve head (ONH) planimetry with two different methods, and to investigate the influence of optic/biometric parameters.
Prospective examination of 106 eyes with OCT Stratus and HRT II. After a complete ophthalmologic examination fundus photographs were taken and mean central corneal power (CCP Zeiss IOLMaster), central corneal thickness (CCT, Tomey AL-1000, SD < 5µm), anterior chamber depth (ACD), axial length (AL, Zeiss IOLMaster), and spherical equivalent (SEQ) were measured. The difference between OCT and HRT values was correlated with the biometric data.
The size of the ONH did not differ significantly (p=0.78) between OCT and HRT II measurements (OCT=2.28+/-0.58 mm², HRT II=2.27+/-0.54 mm², r=0.686 p<0.001). The excavation values of the ONH differed significantly (p<0.001; OCT=1.29+/-0.76 mm², HRT II=0.97+/-0.57 mm², r=0.604 p<0.001). A good correlation of the CCT, CCP, AL, ACD and SEQ was found with the difference of ONH size (OCT-HRT, r=0.593; p<0.001, ANOVA) and ONH excavation (OCT -HRT, r=0.359; p=0.009, ANOVA).
Optic magnification has a significant impact on the papillary planimetry. A correct magnification formula should be applied in the future to offer comparable measurements with different diagnostic glaucoma devices.
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