Janknecht P, Funk J
Univ-Augenklinik, Freiburg, Germany.
Br J Ophthalmol. 1994 Oct;78(10):760-8. doi: 10.1136/bjo.78.10.760.
The accuracy and reproducibility of the optic nerve head analyser (ONHA) and the Heidelberg retina tomograph (HRT) were compared and the performance of the HRT in measuring fundus elevations was evaluated. The coefficient of variation of three repeated measurements in a model eye and in volunteers and the relative error in a model eye was calculated. With ONHA measurements the pooled coefficient of variation in volunteers was 9.3% in measuring cup areas and 8.4% in measuring the cup volume. In a model eye the pooled coefficient of variation was 7.6% for the parameter 'cup area' and 9.9% for the parameter 'cup volume'. The pooled relative error in the model eye was 6.6% for the parameter 'cup area' and 5.1% for the parameter 'cup volume'. With HRT measurements in volunteers the pooled coefficient of variation of both the parameters 'volume below contour' and 'volume below surface' was 6.9%. In the model eye the pooled coefficient of variation was 2.4% for the 'volume below contour' and 4.1% for the parameter 'volume below surface'. The pooled relative error in the model eye was 11.3% for the 'volume below contour' and 11% for the 'volume below surface'. The pooled relative error in measuring retinal elevations in the model eye was 3.8%. The coefficient of variation was 3.5%. The accuracies of the HRT and ONHA were similar. However, as the ONHA 'cup volume' is unreliable in patients because of the design of the ONHA whereas the HRT volume parameters are reliable it seems reasonable to assume that the HRT is superior to the ONHA. Only the HRT is capable of quantifying retinal elevations.
比较了视神经乳头分析仪（ONHA）和海德堡视网膜断层扫描仪（HRT）的准确性和可重复性，并评估了HRT测量眼底隆起的性能。计算了模型眼和志愿者中三次重复测量的变异系数以及模型眼中的相对误差。使用ONHA测量时，志愿者测量杯面积的合并变异系数为9.3%，测量杯容积的合并变异系数为8.4%。在模型眼中，“杯面积”参数的合并变异系数为7.6%，“杯容积”参数的合并变异系数为9.9%。模型眼中“杯面积”参数的合并相对误差为6.6%，“杯容积”参数的合并相对误差为5.1%。使用HRT测量志愿者时，“轮廓下体积”和“表面下体积”参数的合并变异系数均为6.9%。在模型眼中，“轮廓下体积”的合并变异系数为2.4%，“表面下体积”参数的合并变异系数为4.1%。模型眼中“轮廓下体积”的合并相对误差为11.3%，“表面下体积”的合并相对误差为11%。模型眼中测量视网膜隆起的合并相对误差为3.8%。变异系数为3.5%。HRT和ONHA的准确性相似。然而，由于ONHA的设计，ONHA的“杯容积”在患者中不可靠，而HRT的体积参数是可靠的，因此似乎有理由认为HRT优于ONHA。只有HRT能够量化视网膜隆起。
