主观重力垂直线知觉检查及其常值标准

Subjective visual vertical test and its normal value

目的观察不同测试条件对主观重力垂直线知觉(SVV)的影响,建立地面和超重环境下的SVV测试方法和正常值参考标准,为其在前庭耳石器功能评价方面的使用提供实验依据. 方法观察不同的光标长度、初始位置及判断距离对30名健康人SVV的影响,并以此为基础,比较暗室和明室条件测试时SVV有无差别,以及地面和不同超重环境下SVV的分布情况. 结果不同光标长度、位置及距离对SVV无显著影响,暗室条件和明室条件测试的SVV结果基本一致,其间无显著差异.正常人地面条件下的SVV分布比较集中,在偏离实际重力垂直线-3.0°～3.0°的范围波动,超重环境下SVV与实际重力垂直线不符,其与力场作用于人体的角度密切相关,但波动范围较大. 结论在1 G条件下,SVV是比较稳定的一个参数,暗室条件和明室条件测试均可作为SVV的测试方法,可以作为评价前庭耳石器的方法.

Objective To observe the effects of test conditions on the subjective visual vertical （SVV）, establish the method of SVV test, obtain its normal value, so as to provide experimental basis for evaluation of otolith function. Methods Effects of different test conditions including length, initial position of light bar, the distance from light bar to subject on SVV were observed, SVV value tested with dark room mode, light room mode, under 1 G and hypergravity stimulus were compared. Results No Significant effect of test conditions mentioned above on SVV was observed,and the difference between the SVV tested with dark room and light room mode were nonsignificant.The distribution of SVV value tested under 1 G were relatively concentrated, the bias varied between -3.0° to 3. 0° from the gravitational vertical （GV）. The SVV value tested under hypergravity were not coincident with GV, and was highly related with the GIF angle with respect to the subject, and the distribution of SVV value were scattered in a more wide range than that under 1 G. Conclusion SVV tested both with dark room mode and light room mode under 1 G is an accurate, stable and easily obtainable parameter for evaluation of the otolith function.