What’s the mechanic in transparant blue light glasses and how would they help prevent eye fatigue and headaches?
In: Physics
Anti-reflective coatings, or AR, are a film put on a lense to reduce reflection so that the glasses wearer can see better. There are hundreds of varieties for multiple purposes made by many companies.
The blue coating you are referring to is specifically designed to block a specific blue light from your electric device’s screens, but is not that great for keeping refraction from blinding you while you’re driving. In fact, I can’t use my blue light glasses when driving at night, I have to use another pair.
(I work at an optical lab, so I own a lot of glasses.)
There’s multiple ways an AR controls reflection too. The wiki page below can explain it better than I can.
[Anti-Reflective Coatings Wikipedia](https://en.m.wikipedia.org/wiki/Anti-reflective_coating)
Now, as far as how blue light gives you headaches and migraines, every color on the spectrum has a specific wavelength. Apparently the short wavelength of blue gives us these issues, but some is going to have to explain that one to me like I’m five. I read the WebMD article on it and it’s going over my head.
If the glasses are completely transparent with no coloration then they’re not blocking blue light. It’s simply impossible for something to block a certain color of light without changing the color of light that comes through.
They might be blocking ultraviolet light which is beyond the range of human vision. But, that’s a different effect than blocking blue light.
Clear “blue blocking” lens scam works something like this:
The “blue blocking” glasses come with “blue” LED and a test pad to verify that the glasses do actually work.
If you shine the “blue” LED on the test pad it changes color. If you shine the “blue” LED on the pad through the glasses it does not change color.
But the pad is not responding to blue light. The pad responds to UV light. The LED is actually weak UV LED which also has some bule light in it.
So the test pad just tests that the glasses block UV light.
The glasses of course block UV light (this is normal feature with glasses).
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