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 Ix and 6500 K lighting conditions.The steady-state accommodative stimulus response curve (ASRC) and aecommodalive 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 error/accommodative stimulus was reduced after the reading task (P＜0.05).The magnitude of NITM was 0.29±0.24 D.The time decay imdex was 11.23±1838.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.