Barr D B
Tennent Institute of Ophthalmology, Glasgow, Scotland, UK.
Acta Ophthalmol Scand Suppl. 1995(216):1-12. doi: 10.1111/j.1600-0420.1995.tb00344.x.
Estimation of the neuroretinal rim area in absolute units is becoming increasingly desirable in the evaluation of optic discs of glaucoma suspects. There are various methods of optic disc biometry, photogrammetric techniques being the most commonly reported. Any method of estimation of the real dimension of a retinal object must consider magnification due to the patient's eye. Photogrammetric techniques use Littmann's method extensively in this respect, assuming that it is an accurate way of performing the necessary correction. The accuracy of Littmann's method has not yet been assessed in a physiological setting. This study has found that, when the normal distributions of the optical elements eye are considered, in estimating the neuroretinal rim area, the method is at least 86% accurate (95% confidence interval) within an ametropia range -4 to +4 dioptres. This level of accuracy should be considered when drawing conclusions from any study in which Littmann's method is used.
在青光眼疑似患者视盘评估中，以绝对单位估计神经视网膜边缘面积变得越来越必要。视盘生物测量有多种方法，其中摄影测量技术是最常报道的。任何估计视网膜物体实际尺寸的方法都必须考虑患者眼睛造成的放大率。摄影测量技术在这方面广泛使用利特曼方法，假定它是进行必要校正的准确方法。利特曼方法的准确性尚未在生理环境中得到评估。本研究发现，当考虑眼的光学元件的正态分布时，在估计神经视网膜边缘面积时，该方法在-4至+4屈光度的屈光不正范围内至少86%准确（95%置信区间）。在从任何使用利特曼方法的研究得出结论时，都应考虑这一准确度水平。
