In France, when going to an optician to make new corrective glasses, you have an option, "anti-blue". But I have studied physics, and I have learned that if you want to filter blue, you have to use yellow glasses ! So if the glasses are fully transparent, there is no way that they filter blue light. So, is this option just a marketing lie ?
As a tritanopic L dominant / tritanomalic R (yellow/blue blindness full with the dominant eye, and partial on the other) I think there is an equal and unavoidable consequence: blue and green both look like cyan, and purple is pretty much black.<p>Purple isn't likely to be much of a problem, but at night in my city, the buses have blue lights. I can't tell the difference between those lights and the green stoplights with my left eye isolated. I can't see yellow at all with my left eye, but from my right eye it's like a lemon candy version of the No Frills grocery store. Pretty significant difference. Some yellows look pink or beige with the left eye alone. The only colours both eyes generally agree on are cyan and a particular shade of vivid pink, and red. All other colours don't agree (although of course I'm used to it, so I only notice it when using one eye at a time.)<p>I imagine it would be foolhardy to do this to yourself on purpose with glasses you'll be pretty much living your visual life through.
I got that impression as well, which is why I use the program f.lux. On a podcast recently I heard a doctor discuss a company Felix Gray that targets a specific range of wavelengths of blue light. See their page[1] for specifics. I ordered a pair because I needed to spend my vision insurance $ for last year. Lastly, since this post probably won't get much attention, I have a friend doing his PhD work on this area of research, so I'll ask him when I see him in 2 weeks and report back to you :)<p>[1] <a href="https://shopfelixgray.com/lens-technology#eyeglasses" rel="nofollow">https://shopfelixgray.com/lens-technology#eyeglasses</a>