
I recently bought new blue light blocking glasses online. However, since the lenses were clear, I wasn't sure if the lenses actually filtered blue light. I bought a Cyxus card to test blue light and light. I shone blue light through my old unfiltered lenses and the map turned dark blue in seconds. I did the same with my new lenses and the card only changed a very faint blue color. So I think the $5 is well spent knowing that the extra $30 I spent on lenses really works. The only downside is that the blue light flashlight and memory card are sold separately. Since the card is reusable, it seems like they should just sell it together.

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