通过对现实世界、平面图象的视觉成象方式的比较,指出虚拟环境成象方式是二者相结合的产物.在论述虚拟环境所提供的视差对三维深度感知重要性的同时,结合视觉生理特点,分析总结了虚拟环境所具有的缺陷,即违背了视标所发出的入瞳光线的散开度与双眼所处的状态应该相辅相成这一规律,指出了虚拟环境给人造成头晕、眼睛疲劳等不良反应的根源是虚拟对象容易使双眼的辐辏和调节功能发生冲突.最后列举并分析了刷新延迟、分辨率、瞳距等各种可能给观察者带来不良反应的诸多因素.

This paper proposes that the way of imaging on retina in virtual environment(VE) is the combination of both the imaging way of the real world and that of planar images. Since the binocular parallax is important for the three-dimension depth perception, we found that the problem with conventional VE in vision lies in the inconsistency of divergent degree of light with the binocular status. It is also emphasized that the reason of that conventional VE easily causes some persons dizziness and eyestrain is because virtual objects usually make binocular vergence and accommodation conflict. At last, this paper lists and analyzes some factors which might bring discomfort such as delayed effects, resolution, interpupillary distance and so on.