Target spatial frequency determines the response to conflicting defocus- and convergence-driven accommodative stimuli
Target spatial frequency determines the response to conflicting defocus- and convergence-driven accommodative stimuli
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DOI：
10.1016/j.visres.2005.07.014
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发表时间：
2006-02-01
期刊：
影响因子：
1.8
通讯作者：
Bando, T
中科院分区：
文献类型：
--
作者：
Okada, Y;Ukai, K;Bando, T
视疲劳或视觉疲劳是立体三维显示器的观察者经常抱怨的问题。已经提出视疲劳是由反射和会聚刺激之间的冲突产生的异常眼神经反应的结果。通过使用Shin-Nippon SRW 5000红外自动验光仪和利姆布斯跟踪装置连续测量调节和会聚来检验该假设。受试者看到一个高对比度的马耳他十字目标在三个层次的高斯滤波器目标模糊的条件下，相对较低和高的冲突之间的调节和会聚刺激，后者诱导立体视觉的感觉。在低冲突条件下，调节是稳定的，但收敛驱动的调节是占主导地位的目标是非常模糊的。在高冲突条件下，会聚驱动调节的作用随着目标模糊程度的增加而系统地增加。提出当目标包括低空间频率分量时，散焦驱动的调节变弱。一致地观察到对不模糊或仅轻度模糊的步进刺激的大重复过冲，这归因于初始重复响应是收敛驱动的。虽然之前已经报道了高冲突条件是导致视疲劳的可能性，但这是第一个证据表明它们在观看立体显示器时特别影响反射反应。(c)2005爱思唯尔有限公司保留所有权利。
Asthenopia, or visual fatigue, is a frequent complaint from observers of stereoscopic three-dimensional displays. It has been proposed that asthenopia is a consequence of anomalous oculomotor responses generated by conflict between accommodative and convergence stimuli. The hypothesis was examined by measuring accommodation and convergence continuously with a Shin-Nippon SRW5000 infrared autorefractor and a limbus tracking device. Subjects viewed a high contrast Maltese Cross target at three levels of Gaussian filter target blur under conditions of relatively low- and high-conflict between accommodation and convergence stimuli, the latter inducing the sensation of stereopsis. Under the low-conflict conditions accommodation was stable, but convergence-driven accommodation was dominant when the target was extremely blurred. Under the high-conflict conditions the role of convergence-driven accommodation increased systematically with the degree of target blur. It is proposed that defocus-driven accommodation becomes weak when the target comprises low spatial frequency components. Large accommodative overshoots to step stimuli that are not blurred or only mildly blurred were consistently observed and are attributed to the initial accommodative response being convergence-driven. Whereas the possibility that high-conflict conditions are a cause of asthenopia has been previously reported, this is the first evidence that they specifically affect accommodative responses while viewing stereoscopic displays. (c) 2005 Elsevier Ltd. All rights reserved.