
I bought these for my 4 year old who had a headache (for 15-20 minutes at a time) while gaming on the tablet. I wasn't sure if she really had a headache or if she was just pretending, but I got it anyway. It didn't come with the tester but I have one of my blue light blockers and they didn't leave a blue light trail when placed on the tester's card. My 4 year old loves wearing them and no longer complains of headaches! Double win!

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