Also known as: outdoor time, myopia prevention, bright light exposure
Latest evidence update: 2021-07-01
Strongest in Consistency (78). Held back by Recency (11).
Solid mix of RCTs with some methodological gaps.
Some independent replication, statistical precision uneven.
Small combined sample; treat as preliminary.
Studies agree on direction of effect.
Mostly pre-2020 research; updates may be needed.
No per-outcome numbers yet for this one. Each finding's direction and strength is shown in the research below.
Areas where research points to a consistent direction of effect. The strength of evidence is graded; the size of the effect is not quantified.
At least 2 hours of outdoor daylight exposure daily, especially for children and young adults. Strong RCT evidence (LAMP trial and others) for slowing myopia progression. Mechanism: dopamine release from retinal cells in response to bright natural light, which inhibits axial elongation of the eye.
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Intermittent bright light exposure during work hours increased melatonin secretion overlap with scheduled sleep time on the last night shift compared to control.
Morning bright light treatment significantly increased pain threshold more than evening bright light treatment (P < 0.05) in women with fibromyalgia.
Electroencephalographic power spectral density during early slow-wave sleep did not differ between tablet reading and physical book reading conditions.
One hour of bright white light exposure (414 lux) in the morning post-awakening phase increases saliva cortisol concentration compared to dim light (<2 lux).
Bright light exposure prevents post-lunch deterioration in cognitive flexibility (accuracy switch-cost) in well-rested healthy adults.