PURPOSE Visual flicker induces a response in human optic nerve blood flow (F(onh)) and inner retinal activity, as assessed by laser Doppler flowmetry and electroretinogram (ERG), respectively. In this study the relationship was examined between the flicker-evoked changes in F(onh) (RF(onh)) and ERG when various parameters of the stimulus were varied. METHODS In five normal observers (mean age...

The desert climate is endowed by clear sky conditions, providing an excellent opportunity for optimum utilization of natural light in daylighting building indoor spaces. However, the sunny conditions of the desert skies, in countries like Egypt and Saudi Arabia, result in the admittance of direct solar radiation, which leads to thermal discomfort and the incidence of undesired glare. One type o...

Recent studies have explored the synergy of illumination and positioning using indoor lighting infrastructure. While these mainly focused on analysis performance visible light positioning, works did not consider aspects such combined systems. In this paper, we analyse based main characteristics defined in European Standard EN 12464-1, i.e., horizontal illuminance uniformity illuminance. As stan...

Abstract With the aim of knowing perception a university audience four aspects lighting: visual comfort, reading ability, color appearance and global preference, 40 volunteers were surveyed, sitting in front cubicle, which was illuminated by 12 different states lighting. The lighting combination illuminances 100 lx, 200 400 lx or 600 CCT 3500 K, 5000 6500 K. presented one after another randomly...