Jaschinski-Kruza W
Institut für Arbeitsphysiologie, Dortmund 1, FRG.
Ophthalmic Physiol Opt. 1990 Jul;10(3):243-51.
Dark convergence is often measured psychophysically by aligning two dichoptic stimuli, which are briefly flashed in a dark surround. In the present study, the effect of different stimulus parameters on dark convergence measurements was investigated. Chief among these was the effect of viewing distance (50, 100 and 500 cm) of the stimulus. Measured dark convergence was biased towards the actual viewing distance of the stimuli; this effect was stronger with bar stimuli than with point-and-line stimuli. Measured dark convergence depended on the viewing distance to a lesser extent if bar stimuli were observed through pin-holes (open accommodative feedback loop). The subject's knowledge of the viewing distance had a small but significant effect; the size of the nonius bars had none. To reduce artefacts due to the stimulus distance on psychophysical measurement of dark convergence, point-and-line stimuli should be used at a viewing distance of about 1 m. In this case, the effect of stimulus distance can be about 0.25 meter angle (ma), averaged over subjects, but it may be as large as 0.5 ms in some individuals.
暗融合通常通过使两个双眼分离刺激对齐来进行心理物理学测量，这两个刺激在黑暗背景中短暂闪烁。在本研究中，研究了不同刺激参数对暗融合测量的影响。其中主要的是刺激的观察距离（50、100和500厘米）的影响。测得的暗融合偏向于刺激的实际观察距离；这种效应在条形刺激中比在点线刺激中更强。如果通过针孔观察条形刺激（开放调节反馈回路），测得的暗融合在较小程度上依赖于观察距离。受试者对观察距离的了解有微小但显著的影响；视标棒的大小则没有影响。为了减少刺激距离对暗融合心理物理学测量的影响，应在约1米的观察距离使用点线刺激。在这种情况下，刺激距离的影响平均在受试者中约为0.25米角（ma），但在某些个体中可能高达0.5毫秒。
