Re:Blue light filters don't work – controlling total luminan...
by stuckonempty on Friday February 20, 2026 @09:26PM
(#47096859)
Those glasses state that they are the only pair that “blocked 100% of harmful blue light in the 400-450 range”
But melanopsin contained in the cells that regulate circadian rhythms have an absorption spectrum extends to slightly beyond 540 nm (see the OP’s post). As the author says, “It’s not sensitive to blue, it’s sensitive to cyan (and blue and green).”
Those glasses probably do what they say in terms of wavelengths they filter, but they are only partially filtering out light relevant for circadian rhythm regulation and sleep.
But melanopsin contained in the cells that regulate circadian rhythms have an absorption spectrum extends to slightly beyond 540 nm (see the OP’s post). As the author says, “It’s not sensitive to blue, it’s sensitive to cyan (and blue and green).”
Those glasses probably do what they say in terms of wavelengths they filter, but they are only partially filtering out light relevant for circadian rhythm regulation and sleep.