Circadacare logo

The Science


“Our research shows that circadian-effective light, when carefully specified and implemented, can positively impact those living with ADRD in assisted-living and long-term care facilities.”

— Mariana Figuero, Director of the Lighting Research Center (LRC) and Professor of Architecture at Rensselaer Polytechnic Institute

Circadian Cycles in Older Adults

As we age, our eyesight changes dramatically, which results in reduced visual acuity and colour discrimination and a slowing in the rate at which our eyes adapt to changing light levels and contrast. Studies have shown that these changes can lead to disrupted circadian cycles and sleep patterns if not addressed by the lighting design in care environments for older adults.

Newcastle University Research Report

A recent study for Circadacare, which was carried out by Newcastle University’s Arrow Innovation Catalyst with contributions from leading visual neurologist Professor Anya Hurlbert also highlighted other critical aspects of lighting for the older adult.

For older people, light should be bright enough to ensure good vision during the day. But it should also contain enough melanopic lux or circadian stimulus to ensure good sleep/wake cycles and sleep quality, but low enough in very short wavelength power to guard against further eye damage.

Key issues highlighted by the study:


You can gain further insights and knowledge by signing up for our newsletter and downloading our whitepapers.

 Our Partners