Spencer A F, Vernon S A
Department of Ophthalmology, University Hospital, Nottingham, NG7 2UH, UK.
Ophthalmology. 1996 Jan;103(1):163-7. doi: 10.1016/s0161-6420(96)30745-8.
A simple clinical quantitative method of optic disc diameter measurement using a 4-mirror gonioscope contact lens has been described recently.
Intraobserver and interobserver variations are assessed on 77 eyes of 41 patients. Of these eyes, 63 had refractive errors within 3 diopters of emmetropia. The disc was measured by projecting a slit beam of known height onto the disc.
Intraobserver variation: the coefficient of variation was 3.04% for observer 1 (experienced) and 4.76% for observer 2 (novice). The mean of the three measurements by the two observers was not significantly different (P=0.2318). For observer 1, the mean variance of the eyes with higher refractive errors did not differ significantly from the eyes with lower refractive errors. Interobserver variation: the coefficient of variation was 4.52%. The measurements for the novice were slightly larger the smallest discs and slightly smaller for the largest discs (regression analysis P=0.0209).
Repeatability and reproducibility for this method are comparable with other methods of measurement. Until experienced with the technique, the authors recommend that the mean of three readings is used.
最近描述了一种使用四镜房角镜接触镜测量视盘直径的简单临床定量方法。
对41例患者的77只眼进行了观察者内和观察者间差异评估。在这些眼中，63只眼的屈光不正度数在正视眼3屈光度范围内。通过将已知高度的裂隙光束投射到视盘上来测量视盘。
观察者内差异：观察者1（经验丰富）的变异系数为3.04%，观察者2（新手）为4.76%。两位观察者三次测量的平均值无显著差异（P=0.2318）。对于观察者1，屈光不正度数较高的眼的平均方差与屈光不正度数较低的眼无显著差异。观察者间差异：变异系数为4.52%。新手测量的最小视盘略大，最大视盘略小（回归分析P=0.0209）。
该方法的重复性和再现性与其他测量方法相当。在熟练掌握该技术之前，作者建议采用三次读数的平均值。
