Kruger P B
Am J Optom Physiol Opt. 1977 Oct;54(10):673-7. doi: 10.1097/00006324-197710000-00004.
Book retinoscopy involves the observation of fundus reflex changes that are said to be related to the reading levels or interpretive levels at which persons are functioning. Recent investigations have shown that increasing the cognitive demand on a person can result in accomodative changes in his eye that increase the luminance of the fundus reflex. Since the ability of observers to distinguish such changes is not known, this experiment was designed to determine the minimum detectable increase in luminance. The experiment involved a 2-alternative forced-choice procedure in which observers were required to indicate during which of 2 designated intervals the reflex from a schematic eye became brighter. The luminance of the reflex had to increase by at least 11% beforeit could be detected. A reduction in the lag of accommodation and dilation of the pupil probably account for the changes observed during book retinoscopy.
书本视网膜检影法涉及观察眼底反射变化，据说这些变化与人们所处的阅读水平或理解水平有关。最近的研究表明，增加对一个人的认知需求会导致其眼睛出现调节变化，从而增加眼底反射的亮度。由于观察者辨别此类变化的能力未知，因此设计了该实验来确定可检测到的最小亮度增加量。该实验采用二选一的强迫选择程序，要求观察者指出在两个指定间隔中的哪一个期间，来自模拟眼的反射会变亮。反射的亮度必须至少增加11%才能被检测到。调节滞后的减少和瞳孔的扩张可能是书本视网膜检影法期间观察到的变化的原因。
