Seems like they're debunking a claim that's not actually their selling point.
https://www.health.harvard.edu/staying-healthy/blue-light-ha...
> The idea behind blue-blocking lenses is to stop the light from entering the eye and throwing the circadian rhythm off; however, this has not been established with any degree of certainty in clinical studies, Miller said. [...]
Then it goes on, mentioning some research in more detail. However, the article doesn't interpret anything, or talk about why the research about lens effect provided inconsistent results, or even link to the actual research where this may be explained.
Personally, I find that light reduction in general and blue light reduction in particular help me to fall asleep and she'll better. It could be placebo, but I don't care. I like to feel rested.
Blue light filtering + glasses make me feel comfortable and good.
I don't care if it is placebo.
I wear prescription glasses anyway, and I pay about ~5 bucks extra (two years per glass), and blue light filters are free in phones and displays.