Jaschinski-Kruza W
Institut für Arbeitsphysiologie, Universität Dortmund, Germany.
Ophthalmic Physiol Opt. 1993 Jan;13(1):27-34. doi: 10.1111/j.1475-1313.1993.tb00422.x.
Fixation disparity was measured while subjects observed a realistic alphanumeric pattern on the cathode ray tube (CRT) of a visual display unit at viewing distances of 25-85 cm. The psychometric function of fixation disparity was determined by analysing the observers' responses to a series of short (100 ms) flashes of nonius targets that were superimposed on the CRT-image by means of a half-silvered mirror. Test-retest correlation of fixation disparity was high (r = 0.8) at viewing distances of 40 and 82 cm and lower (r = 0.55) at the shorter distance of 26.5 cm. Mean fixation disparity increased to a more exophoric condition as the display approached the eyes. However, this effect was observed only in some of the subjects, so the susceptibility of fixation disparity to viewing distance appears to be an individual characteristic. When subjects observed the VDU screen continuously for 30 min at viewing distances of 85, 47, 31 and 25 cm in different sessions, fixation disparity and accommodation remained unchanged over time.
在受试者于视觉显示单元的阴极射线管（CRT）上观察真实字母数字图案时，在25 - 85厘米的观察距离下测量了注视视差。通过分析观察者对一系列借助半镀银镜叠加在CRT图像上的纳侬靶标短（100毫秒）闪光的反应，确定了注视视差的心理测量函数。在40厘米和82厘米的观察距离下，注视视差的重测相关性较高（r = 0.8），而在26.5厘米的较短距离下则较低（r = 0.55）。随着显示器靠近眼睛，平均注视视差增加到更外隐斜的状态。然而，这种效应仅在部分受试者中观察到，因此注视视差对观察距离的敏感性似乎是个体特征。当受试者在不同时段分别于85厘米、47厘米、31厘米和25厘米的观察距离下连续观察VDU屏幕30分钟时，注视视差和调节随时间保持不变。
