Most of the glasses I've seen online are scams. Just plastic lens with UV blocking. The ones that come with a "special blue light Lazer" to demonstrate that's it's working are definitely a scam. In order to block blue light you'll need lenses with a tint. Most likely they will be tinted orange.
If you want a simple test to see how effective they are at blocking blue light, set an LED screen to blue, and see how much color comes through the lens. Most of the glasses I've seen advertised (and my wife has bought - meh lesson learned at least they were cheap) either have no tint, or it's so subtle it mind as well not be there.
If you want a simple test to see how effective they are at blocking blue light, set an LED screen to blue, and see how much color comes through the lens. Most of the glasses I've seen advertised (and my wife has bought - meh lesson learned at least they were cheap) either have no tint, or it's so subtle it mind as well not be there.