ScreenTime Blue Blocking Screen Filter — iPhone
Adhesive screen filter that physically blocks blue and green light from your iPhone display — for evening use without dimming distortion.
~£19.95
Buy now → // 02 · TIMING
Circadian Rhythm
Light timing, sleep and jet lag — the clock behind your performance.
Your body runs on a clock that is set, every day, by light. Get the timing right — bright mornings, dim and warm evenings — and sleep, mood and recovery follow. Get it wrong, through late screens or long-haul travel, and the clock drifts. This is the most powerful, most under-used lever in endurance sport.
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Key reading
Start here.
The Science · 5 min read
Does Erling Haaland wear blue light glasses?
Erling Haaland wears blue-blocking glasses every night and calls sleep the most important thing in the world. Here is what he actually does — and whether the glasses deserve any of the credit.
08 JUL 2026
The Science · 5 min read
Do blue light glasses actually work?
A closely-read verdict on blue light glasses — what the best evidence says about eye strain, sleep and athletic performance, and where the hype falls apart.
29 JUN 2026
The Science · 7 min read
Why do footballers wear blue light blocking glasses
Marcos Llorente played 26 straight matches in tinted glasses, and Erling Haaland publicly backed him. The story sits in a more interesting place than either the hype or the backlash admits — here is what the evidence actually shows.
27 JUN 2026
Load · 9 min read
Why Esteban Ocon's Sunglasses Matter — and How Tom Clark Turned That Insight Into Phaze
Esteban Ocon's paddock sunglasses look like style, but they're the visible tip of a circadian performance system built around controlling light exposure — the same science coach Tom Clark has now productized into Phaze.
26 JUN 2026
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The kit that fits
Reviewed for this topic.
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Put it to work
Interactive tools.
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See it in the field
How the pros use it.
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