Ciuffreda K J, Rosenfield M, Rosen J, Azimi A, Ong E
Department of Vision Sciences, SUNY/State College of Optometry, NY 10010.
Ophthalmic Physiol Opt. 1990 Apr;10(2):168-74. doi: 10.1111/j.1475-1313.1990.tb00971.x.
Steady-state accommodative responses to a wide range of commonly encountered textural and graphic stimuli were investigated in 12 young, visually normal subjects. Details of two experiments are described. In the first experiment, stimuli were varied in terms of size, contrast, spatial frequency, colour and intellectual demand. In the second experiment, only the colour of the targets was systematically altered. In both experiments the stimulus demand was maintained at 3 D, and accommodation was measured subjectively using a Hartinger coincidence optometer. No significant difference in mean accommodative response was observed between the widely differing targets adopted in either experiment. These findings suggest that an overall threshold exists for accommodative stimuli, with supra-threshold targets of low to moderate contrast being capable of initiating and sustaining an appropriate accommodative response.
对12名视力正常的年轻受试者进行了研究，以探讨他们对各种常见纹理和图形刺激的稳态调节反应。文中描述了两个实验的细节。在第一个实验中，刺激在大小、对比度、空间频率、颜色和智力需求方面有所变化。在第二个实验中，仅系统地改变目标的颜色。在两个实验中，刺激需求均保持在3D，并且使用哈廷格重合验光仪主观测量调节。在任一实验中采用的差异很大的目标之间，未观察到平均调节反应的显著差异。这些发现表明，调节刺激存在一个总体阈值，低至中等对比度的超阈值目标能够启动并维持适当的调节反应。
