The aim of the present study is to characterize everyday light conditions of younger and older adults and to consider them in relation to cardiovascular, metabolic and psychological health. An ambulatory assessment approach will be used over 12 days, measuring physiological parameters and daily thoughts, behaviors and experiences of different age groups using wearable technologies (e.g., light sensors, activity trackers, continuous glucose monitors) and smartphone-based self-reports (e.g., mood, vitality). At the beginning of the study, the degeneration of the lens and retina of the participants is objectively quantified by ophthalmologists. On the last two days, participants will spend one working day in dim light and another in bright light in randomized order under the same measurement protocol as before in order to experimentally assess their sensitivity to light and its health effects.
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Mean melanopic EDI (lux) from 09:00 to 17:00 h (daytime in European winter months)
Timeframe: Over the 10-day ambulatory assessment period
Mean melanopic EDI (lux) 2 hours before individual bedtime
Timeframe: Over the 10-day ambulatory assessment period