测量长期光辐射下人眼对比度敏感函数及模型

Function and Model of Human Contrast Sensitivity Measurement Under Long Term Optical Radiation

正常环境下研究得出的对比敏感度函数模型,在人眼受长时间高亮度电脑或手机显示屏光辐射(即视觉异常)时不再适用。文中基于正弦光栅的计算公式在Matlab中编程得到了实验所需的正弦光栅。由于在不同光谱功率分布下的对比敏感度值会有较大差别,实验基于LCD显示器得出视觉异常实验者在不同光谱功率分布(日光,灯光)下的对比敏感度值和CSF曲线。并通过非线性最小二乘法得出视觉异常时CSF模型。其结果表明,视觉异常时人眼最敏感空间频率和光学成像能力均发生了较大变化,且节能灯和显示屏等非自然光源与自然光源日光相比其光谱功率分布对人眼对比敏感度的影响最大。

The contrast sensitivity function and model obtained under normal environment no longer applies in the case of long time exposure of the human eyes to high brightness in computer or mobile phone screen radiation （ i. e. abnormal visual）. The sine grating needed for the experiment is obtained based on the calculation formula of sine grating by matlab programming. Because under different spectral power distribution of contrast sensitivity can have very different values, the contrast sensitivity and CSF curve values of the subjects with visual abnormalities in differ- ent spectral power distribution （ sunlight and lighting） are obtained by experiments based on LCD display. Then the nonlinear least squares method is used to formulate the CSF model in abnormal visual case. Results show that the spatial frequency to which the human eye is more sensitive and the optical imaging capabilities have changed a lot in case of the abnormal vision, and that the spectral power distribution of the energy-saving lamps have greater impact on human eyes than that of natural sunlight.