关键词: 光辐射, 视觉异常, 光谱功率分布, 对比度敏感, 视觉异常CSF模型

Abstract:

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 different 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.

Key words: optical radiation;visual exception;spectral power distribution;contrast sensitivity;CSF model of abnormal visual