Dynamic measurement of accommodative responses while viewing stereoscopic images
Dynamic measurement of accommodative responses while viewing stereoscopic images
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DOI：
10.1080/09500340701467652
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发表时间：
2008-02
影响因子：
1.3
通讯作者：
Masahito Torii;Yuuki Okada;K. Ukai;J. Wolffsohn;B. Gilmartin
中科院分区：
文献类型：
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作者：
Masahito Torii;Yuuki Okada;K. Ukai;J. Wolffsohn;B. Gilmartin
采用视频折射法测量了调节和收敛对调节刺激（冲突立体图像）不变时收敛刺激的阶跃变化的动态响应，并与非冲突目标刺激的动态响应进行了比较。使用了三个不同空间频率分量的目标。在7个受试者中，有4个受试者仅在相互冲突的刺激下出现了明显的适应性瞬时超调。其中一种表现出适应性和收敛性振荡，可能是由于立体目标具有较高的空间分量时难以融合，而当目标经过空间低通滤波后，这种振荡减弱。我们假设对阶跃刺激的瞬态反应是由收敛驱动的调节引发的，随后是由模糊量调制的较慢的调节精细控制。在趋同驱动的迁就方面的主体间差异也可能是一个需要考虑的因素。对于立体刺激，有人提出，在调节反应开始后立即增加模糊会抑制反应的停止。
Using video refraction accommodative and convergence dynamic responses were measured to stepped changes in convergence stimuli with unchanged accommodative stimuli (conflicting stereoscopic image) and compared with responses to non-conflicting target stimuli. Three targets were used that varied in their spatial frequency components. An accommodative transient overshoot was evident in four out of seven subjects for only conflicting stimuli. One showed accommodative and convergence oscillation probably due to difficulty in fusing the stereoscopic target when it had a higher spatial component, however, this oscillation diminished when the target was spatial low-pass filtered. We hypothesise that transient responses to step stimuli is initiated by convergence-driven accommodation and subsequently followed by slower fine-control of accommodation modulated by the amount of blur. Inter-subject differences in convergence-driven accommodation may also be a factor to consider. For stereoscopic stimuli, it is proposed that the increase in blur immediately after the onset of the accommodative response inhibits cessation of the response.