Augsburger A, Sheedy J E, Schoessler J P
Am J Optom Physiol Opt. 1979 Aug;56(8):531-7. doi: 10.1097/00006324-197908000-00008.
The luminance of the background and of the target (visual acuity letter) was measured for five commonly used visual acuity screen materials. Most materials were found to be highly nonlambertian. A greater than threefold difference in reflectance normal to the surface was found for the respective screens tested. The percent polarization maintained by each screen material, using American Optical Vectograph systems, was measured. The relative illuminations generated by eight projector systems were compared. A discussion of the factors and recommendations for improvements related to projected chart visibility are made.
针对五种常用的视力筛查材料，测量了背景和目标（视力字母）的亮度。发现大多数材料的朗伯特性都很差。在所测试的各个屏幕中，发现垂直于表面的反射率存在三倍以上的差异。使用美国光学矢量图系统测量了每种屏幕材料保持的偏振百分比。比较了八个投影仪系统产生的相对照度。讨论了与投影图表可见性相关的因素并提出了改进建议。
