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Sure but how do you account for two of them not working vs other ones working? It's likely doing some effect, but it seems to be just nuanced enough.

I feel like after I got the filter on my glasses that when I lay in bed, I'm not laying there feeling unable to sleep like I would many nights before. Is it placebo? Maybe, but I totally forgot I got the filter on my glasses and realized sometime later.

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Simple. When the original poster tries a new pair, they assume it may not work. If they happen to feel pain they mentally mark the glasses as “one of the bad ones”. From then on the placebo effect won't apply to that pair because they don’t believe it will help.

Humans are great at finding patterns in randomness like this; this is exactly why superstitions are so prevalent.

It is possible that some pairs of said glasses were flawed -- and as such detrimental -- while other benign pairs were not.

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