Physio用sychological bra in responses to light and adaptation to health risk

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The effects of light intensity, color, and way of light exposure on physiological responses were examined. The countermeasures to prevent lightinduced melatonin suppression in night workers were also examined. We found the following results : 1) The pupillary light reflex by light exposure to nasal retina was significantly larger than that to temporal retina, but difference in melatonin suppression was not significant. 2) The pupillary light reflex and increase in total hemoglobin concentration by exposure to blue monochromatic light was significantly larger than those by exposure to red light. 3) Wearing a red-visor cap or taking a nap during night work were useful countermeasure to prevent lightinduced melatonin suppression in night workers.