[bluechair]

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.

[cenamus]

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

[AnthonBerg]

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?

[alexey-salmin]

Probably the pupils dilate due to overall decrease in light intensity