Spencer A F, Sadiq S A, Pawson P, Vernon S A
Department of Ophthalmology, University Hospital, Nottingham, United Kingdom.
Invest Ophthalmol Vis Sci. 1995 Apr;36(5):796-803.
To compare measurements of the vertical diameter of the optic disk using the Heidelberg Retinal Tomograph (HRT) and planimetric methods.
On the HRT, three measurements of the vertical disk diameter were made on 32 eyes from a composite image using the circle draw facility and were compared with three measurements of the central image of the 32 tomographic cuts. These were repeated by a second observer. Measurements were compared with those obtained from photographs using the three corrections described by Bengtsson and Krakau.
For the HRT, there was minimal intraobserver variation, coefficient of variation (1.515% to 1.882% for the two observers). Interobserver variation was also small (CoV 1.969%). The authors found the closest agreement with the HRT measurements using regression analysis was obtained using correction 3 (r = 0.8258). HRT measurements were significantly smaller (P < 0.0001) by a constant amount of 0.13 mm across the range of optic disk size. There was a significant difference between the HRT measurement of the composite image and the central cut (P = 0.0003 for observer 1).
HRT measurements are significantly smaller than those from photographs and, therefore, are not interchangeable.
比较使用海德堡视网膜断层扫描仪（HRT）和平面测量法对视盘垂直直径的测量结果。
在HRT上，使用画圆工具对32只眼睛的合成图像进行三次视盘垂直直径测量，并与32个断层扫描切面的中央图像的三次测量结果进行比较。由另一位观察者重复上述操作。测量结果与使用本特松和克拉考描述的三种校正方法从照片中获得的测量结果进行比较。
对于HRT，观察者内差异极小，变异系数（两位观察者分别为1.515%至1.882%）。观察者间差异也很小（变异系数为1.969%）。作者发现，使用回归分析，与HRT测量结果最接近的一致性是使用校正3获得的（r = 0.8258）。在整个视盘大小范围内，HRT测量结果显著更小（P < 0.0001），恒定差值为0.13 mm。合成图像的HRT测量结果与中央切面之间存在显著差异（观察者1，P = 0.0003）。
HRT测量结果明显小于照片测量结果，因此两者不可互换。
