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How do Blue Light Testing Card Work?

Mur testing card adopts photochromic technology. It is printed with photochromic ink,which is sensitive to the blue light. Put it simply, when the test card is exposed to the blue light, it will turn into a dark-color one. When the blue light is removed,it will turn back to white in a short time.

Instruction:

When the testing card is exposed under the blue light directly, its color will change apparently. And we can judge the amount of the blue lights from the color. It can be said that the darker the color is, the more the blue lights are. When we shine the testing card through the lens, we can know the quality of the lens through the color change. If there no color change or just a slight color change can been seen, the lens can be said to be effective. On the other hand, the testing card changes in its color, it cannot filter the bad blue lights.

Testing Steps:

1.Put the lens on the testing area, and shine the testing card for 5 seconds. 

2.One part of testing card becomes dark greatly, while the other part sheltered by the lens doesn’t change color.

3.Remove the lens and shine on the testing card, then it darkens, too.

Get customer attention by clean visual and video

Livho lens can block the harmful blue light.

LH-Noah - Best Blue Light Blocking Reading Glasses
LH-Noah - Best Blue Light Blocking Reading Glasses
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Noah

$41.00
Blue Light Blocking Glasses
Prevent 100% of UV400
Size: Medium
Lens: Polycarbonate
Measurements: 52 - 18 - 148
Material: Acetate
Weight: 23g
Yasir - Best Blue Light Blocking Reading Glasses
Yasir - Best Blue Light Blocking Reading Glasses
Yasir - Best Blue Light Blocking Reading Glasses
Yasir - Best Blue Light Blocking Reading Glasses
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Yasir - Best Blue Light Blocking Reading Glasses
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Yasir

$38.00
Livho Sauvage Blue Light Sunglass
Sauvage Blue Light Sunglass
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Sauvage

$30.00
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LH-Rhea

$37.50

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