I’ve been looking at blue blocker sunglasses for circadian rhythm, but will any pair of orange lenses work or does there need to be something special about them (a certain shade of orange/red or orange/yellow, a certain coating, etc)? Will yellow lenses block the blue spectrum? I think 460nm is the spectrum of blue that affects sleep cycle, so where is the opposite on the color wheel from that?
With a pair I picked up on the cheap, I can still see blue (but it is subdued) and after wearing the glasses for a while when I take them off everything has a blue tint for a few seconds. The road, cars, etc has a blue shade to it. Is that due to my eyes adjusting to not seeing blue, then being overwhelmed when I take the glasses off? Should true blue blockers make all blue appear a different color (these glasses just make the color blue seem subdued)? Is everything having a blue tint when I take the glasses off normal?
Amber/brown should block blue light just as well. What you don’t want is drastic alteration of colors.
My current sunglasses use Drivewear lenses (reddish-brown in full sunlight) and I’m hard pressed to even tell what color lens I’m looking through and colors are unaltered.
All orange glasses will block blue light, but they won’t necessarily block all of it, or as much of it as you’d like them to block. They also won’t necessarily block ultraviolet.
Tinted lenses do not necessarily block a specific wavelength. Unless you have a way of measuring the transmittance (spectroradiometer) then you have only the data supplied by the manufacturer to go on, so that’s not really something we can answer about a given generic glasses. The ones that might have data you will probably need to pay a premium for.
Yes that’s a normal side effect to a very useful part of our visual system. No worries!
Yeah, that blue tint color effect you’re experiencing after taking the glasses off is called chromatic adaptation. That’s just how our visual system works. If you google, you can find a number of optical illusions that work on this principle. I do a lot of photo editing, and I have to take breaks every twenty or thirty minutes and look at something else other than the photos I’m trying to color correct as I’ve found if I go for too long, I risk myself introducing color casts to photos because of chromatic adaptation.