Pupil size under different lighting sources

The objective of this work is to monitor the effects of light on pupil size considering different type of sources and retinal images in order to isolate the effect of dimension and spectra distribution of the emitted radiations. A pupillometric system has been built, constituted by an infrared illuminator and a high-resolution camera, in order to acquire eye images and get pupil dimensions through an ad hoc designed software. From the first tests differences on pupil size due to different spectrum and shape of sources has been founded even at equal luminance of the source. This study, as a basic research on measurements of photobiological effects of light, would improve the knowledge of human visual system especially for applications in lighting design like road lighting or where psychophysical effects of light are important issues. The activity described is a part of the EMRP project ENG05: Metrology for solid state lighting. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.