Iwasaki Tsuneto, Tawara Akihiko
Department of Ophthalmology, University of Occupational and Environmental Health, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu 807-8555, Japan.
Nippon Ganka Gakkai Zasshi. 2004 Jan;108(1):5-11.
We measured the accommodative response in order to investigate the influence of a visual function when gazing at stereoscopic images presented on a three dimensional display.
Accommodative step responses were measured using an infrared optometer, setting the far target at the distance of 1 m and the near target at the distance of 50 cm. The step response of the right eye was examined 6 times at 10-second intervals. The far target was a starburst as a real image and the near target was a white circle on a random dot background on a parallax barrier system three-dimensional display as a stereoscopic image generated with a 90-min arc binocular crossed disparity(+1.5 degrees) and a 90-min arc binocular uncrossed disparity (-1.5 degrees), and a 0-min disparity (0 degree). The near target was presented in 4 ways: 1. -1.5 degrees disparity alone, 2. 0-min disparity alone, 3. +1.5 degrees disparity alone, and 4. +1.5 degrees and -1.5 degrees disparity alternately.
In conditions 1 to 3, the mean +/- standard deviation values of the accommodative response were 0.59 +/- 0.16 D, 0.72 +/- 0.11 D, and 1.03 +/- 0.21 D, respectively. The accommodative response was very large at the disparity of +1.5 degrees compared with the disparity of 0 degree (p = 0.0300). It was not significant although there was a tendency to become small at the disparity of -1.5 degrees (p = 0.0707). In condition 4, the mean +/- standard deviation values of the accommodative response were 0.62 +/- 0.12 D in the condition of -1.5 degrees and 1.03 +/- 0.26 D in condition +1.5 degrees with significant difference (p = 0.0122).
The over accommodation response is induced when gazing at a stereoscopic image under the condition of binocular crossed disparity. This indicates that gazing at stereoscopic images has ill effects on the accommodative system.
我们测量了调节反应，以研究注视三维显示器上呈现的立体图像时视觉功能的影响。
使用红外验光仪测量调节阶跃反应，将远目标设置在1米的距离，近目标设置在50厘米的距离。右眼的阶跃反应每隔10秒检查6次。远目标是作为实像的星芒，近目标是视差屏障系统三维显示器上随机点背景上的白色圆圈，作为具有90分视角双眼交叉视差（+1.5度）、90分视角双眼非交叉视差（-1.5度）和0分视角视差（0度）生成的立体图像。近目标以4种方式呈现：1. 仅-1.5度视差，2. 仅0分视角视差，3. 仅+1.5度视差，4. +1.5度和-1.5度视差交替呈现。
在条件1至3中，调节反应的平均值±标准差分别为0.59±0.16D、0.72±0.11D和1.03±0.21D。与0度视差相比，+1.5度视差时的调节反应非常大（p = 0.0300）。尽管在-1.5度视差时有变小的趋势，但差异不显著（p = 0.0707）。在条件4中，-1.5度条件下调节反应的平均值±标准差为0.62±0.12D，+1.5度条件下为1.03±0.26D，差异有统计学意义（p = 0.0122）。
在双眼交叉视差条件下注视立体图像时会诱发过度调节反应。这表明注视立体图像对调节系统有不良影响。
