[时间频率对扫描模式视觉诱发电位视力的影响]
[Effects of temporal frequency on the sweep pattern visual evoked response acuity].
作者信息
Liu Rui-Jue, Chen Jie-Min, Xia Wen-Tao, Fan Li-Hua, Zhu Guang-You
机构信息
Shanghai Key Laboratory of Forensic Medicine, Institute of Forensic Science, Ministry of Justice, Shanghai 200063, PR China.
出版信息
Fa Yi Xue Za Zhi. 2009 Dec;25(6):409-11.
OBJECTIVE
To investigate the changes of sweep pattern visual evoked response (SPVER) acuity in different temporal frequency.
METHODS
The persons were collected and divided into the low visual acuity group (71 eyes) and the high visual acuity group (92 eyes). The eyes were stimulated with different temporal frequency (8.5 Hz, 10 Hz, 15 Hz and 20 Hz, respectively) and the same series of spatial frequency. The accuracy of SPVER acuity in different temporal frequency was evaluated by compare the SPVER acuity with the subjective vision.
RESULTS
In the low visual acuity group, there was a good correlation between the SPVER acuity and the subjective vision applying the spatial frequency of the group. In the high visual acuity group, the SPVER acuity was lower than the subjective vision. SPVER acuity showed a good correlation with the subjective vision at the temporal frequency of 10 Hz in two groups.
CONCLUSION
The temporal frequency can influence SPVER accuracy, so it is necessary to select the suitable stimulation condition in forensic practice.
目的
探讨不同时间频率下扫描模式视觉诱发电位（SPVER）视力的变化。
方法
收集研究对象并分为低视力组（71只眼）和高视力组（92只眼）。分别用不同时间频率（8.5Hz、10Hz、15Hz和20Hz）和相同系列空间频率刺激眼睛。通过将SPVER视力与主观视力进行比较，评估不同时间频率下SPVER视力的准确性。
结果
在低视力组中，应用该组空间频率时，SPVER视力与主观视力之间存在良好相关性。在高视力组中，SPVER视力低于主观视力。两组在10Hz时间频率下，SPVER视力与主观视力均显示出良好相关性。
结论
时间频率可影响SPVER准确性，因此在法医实践中选择合适的刺激条件很有必要。
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