结论
本研究通过人因实验系统性对比了PWM调光与DC调光对人眼视功能的影响,结合生理指标量化分析,得出以下核心结论:
(1)在50±3nit亮度条件下,DC调光对高阶像差(HOA4,散焦)和调制传递函数(MTF,视觉分辨率)的影响显著小于PWM调光。
(2)两种调光方式在调节波动(∆ACC)指标上无显著差异,表明PWM调光的高频扰动未显著加剧睫状肌调节负荷或视网膜神经适应性疲劳。
(3) 两种调光方式下的球面像差(∆HOA12)、彗差(∆Coma)、三叶草像差(∆Clover)差异未达显著水平。但从均值来看,DC调光引发的视觉参数波动整体小于PWM调光。
我们推断,PWM调光通过快速开关调节亮度,尽管超过人眼临界融合频率(CFF≈60Hz),但这种机械振动可能改变眼球光路的波前像差分布,降低MTF截止频率,削弱细节分辨能力。
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作者:郭娅 中国标准化研究院公共安全所
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