冷色亮光照明下持续阅读对青少年调节功能的影响

目的 观察冷色亮光照明下持续阅读对青少年调节功能的影响 方法 自身对照实验研究.18名年龄为(11.2±2.2)岁的青少年在1000 Ix光照度、6500 K色温的照明条件下完成40 min阅读任务,检测阅读前后的调节刺激反应曲线、调节误差和近距离工作相关性暂时性近视结果持续阅读后平均调节误差率(调节误差/调节刺激)显著减小(P＜0.05)阅读后呈现的近距离工作相关性暂时性近视幅度为(0.29±0.24)D,时间指数为11.23±18.58.调节刺激反应曲线的斜率和截距,及3D调节刺激时的调节反应在阅读前后差异没有统计学意义 结论 冷色温与高照度搭配的照明条件既可增加阅读时调节反应的准确性,持续阅读后也不会引起显著的近距离工作相关性暂时性近视、或可降低近距离阅读时的视网膜离焦量,减少近视进展机率.

Effects of sustained near work under cold bright light on the accommodation of children

Objective To investigate the effect of asustained reading task under cold bright light on steady-state accommodation in youths. Methods It was a self control study. Eighteen children with a mean age of 11.2±2.2 years performed a 40-minute reading task under 1000 lx and 6500 K lighting conditions. The steady-state accommodative stimulus response curve （ASRC） and accommodative error were measured before and after the reading task. Near work-induced transient myopia （NITM） was measured immediately after the reading task followed by ASRC measurement. Results The mean ratio of accommodative e~Tor/accommodative stimulus was reduced after the reading task （p〈0.05）. The magnitude of NITM was 0.29±0.24 D. The time decay index was 11.23±18.58. The gradient and slope of ASRC and accommodative response did not change significantty after reading task. Conclusion Prolonged near work under cold bright light tends to improve accommodative accuracy and produce moderate near work-induced transient myopia. School children can use cold bright light while reading.