The two currently widely used indexes, Near Point Distance ( NP ) and Critical Flicker Fusion(CFF) Frequency ( CFF ), have their intrinsic defects. 目前广泛使用的调节近点距离和闪烁融合频率这二项评价视觉疲劳的指标存在着固有的缺欠。
The heart rate increased and the critical flicker fusion frequency decreased during walking, but no significant differences were observed between different walking times. 结果表明,劳动后心率升高,闪光融合频率降低,但不同劳动时间之间无明显差别。