Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
Jpn J Radiol. 2011 Aug;29(7):483-7. doi: 10.1007/s11604-011-0585-7. Epub 2011 Sep 1.
The aim of this study was to investigate eye fatigue that could impair diagnostic accuracy by measuring the critical flicker fusion frequency (CFFF) before and after reading.
CFFF was measured before and after about 4 h of health checkup reading in seven healthy volunteer radiologists. A questionnaire was also completed on duration of sleep the night before the experiment, average duration of sleep, and subjective fatigue using a visual analog scale (corrected to a 0-1 scale, 0 indicating the worst fatigue ever experienced).
After-reading subjective fatigue was significantly greater (before 0.52 ± 0.15, after 0.42 ± 0.15), and CFFF was significantly lower (before 40.9 ± 2.4, after 39.9 ± 2.0). There was no significant correlation between subjective fatigue and CFFF, either before or after or between before- and after-reading differences in subjective fatigue and CFFF. Shorter duration of sleep the night before significantly correlated with lower CFFF (Pearson's correlation coefficient): before 0.42, P = 0.0047; after 0.52, P = 0.0003.
CFFF declines after reading and can be considered useful as an indicator of fatigue induced by radiology reading. CFFF declines significantly when sleep is reduced the day before reading without correlation with subjective fatigue, meaning that sleep deprivation can cause an unaware decline in visual function.
本研究旨在通过测量阅读前后的临界闪烁融合频率（CFFF），来研究可能影响诊断准确性的眼疲劳。
在 7 名健康志愿者放射科医生进行约 4 小时健康检查阅读前后，测量了 CFFF。还使用视觉模拟量表（校正为 0-1 刻度，0 表示经历过的最严重疲劳），完成了关于前一晚睡眠时间、平均睡眠时间和主观疲劳的问卷。
阅读后主观疲劳明显增加（阅读前 0.52 ± 0.15，阅读后 0.42 ± 0.15），CFFF 明显降低（阅读前 40.9 ± 2.4，阅读后 39.9 ± 2.0）。阅读前后主观疲劳和 CFFF 之间均无显著相关性，也无阅读前后主观疲劳和 CFFF 差异之间的相关性。前一晚睡眠时间较短与 CFFF 降低显著相关（Pearson 相关系数）：阅读前 0.42，P = 0.0047；阅读后 0.52，P = 0.0003。
阅读后 CFFF 下降，可作为放射科阅读引起的疲劳的指标。阅读前一天睡眠时间减少与主观疲劳无相关性时，CFFF 显著下降，这意味着睡眠剥夺可能导致视觉功能的无意识下降。
