[Effects of field viewing angles on object judgement [correction of jubgerent] in virtual environment].

Object: To investigate the effect of viewing angle on human judgement reliability for objects in virtual environment.

Method: Firstly, pre-tests were done with the PC virtual reality ergonomic system to determine difference among observed object and values of viewing angle. Then, one factor, 4-levels full random experiments were done with 45 health human subjects (male and female nearly 1:1).