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Anecdotal, so take this with a grain of salt: I’ve used a pair of red light glasses from a Dr in the UK and saw noticeably improved vision.

With those the same amount of red light would have hit your retinas anyways, no?

Yes, pretty much I’d think—but less of the other wavelengths.

I imagine that this could serve as different enough input to matter. With the eyes being a very expensive and highly-strung instrument and all?

Probably the pupils dilate due to overall decrease in light intensity