[noiseman]

The last time I had to update my eyeglass prescription, it was virtually impossible to get lenses that didn’t have some level of blue filter applied. The first lenses I tried had some issues (the wonders of progressive lenses - so incredibly finicky), and they also came with a heavy blue filter. I hated that, because removing most of the blue light shifted colors and made everything look yellow.

I had the lenses remade, in a different lens material to try to solve the refraction problems, and I instructed that I didn’t want any blue-blocking filter. They tried hard to sell the blue filter, making it sound like LED screens would make you go blind without it, but I still told them no. Yet, when I picked them up I noticed in the mirror that the lenses had a slight purple tint (which is what others see if you have a blue-blocking coating).

Ultimately, I kept those lenses because the refraction was much better and I was tired of going back. The blue filtering is more subtle than the original pair, but still introduces a slight yellow tint. Makes it impossible to calibrate my TV without removing my glasses.

I think it’s just a fad, and an excuse to pad sales with an additional charge.

[Calvin Locke]

Back in late 1970s/early 1980s, Scandinavian countries mandated the use of/access to, amber crts for workers.

Maybe the white phosphorous had skewed towards the blue too much?