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If You Have Dark Eye Circles, Your Body May Be Trying to Warn You
The thin delicate skin underneath your eyes, known as the periorbital area, allows blue or violet wavelengths to pass through ...
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Why Veins Look Blue
blue light will hit the space above the vessel and bounce back to our eyes before it's ever absorbed. [See diagram at right.] In short, veins look blue because they carry deoxygenated blood ...