Red-eye in photos is caused by light from the flash bouncing off the capillaries in your eyes.

Red-eye in photos is caused by light from the flash bouncing off the

More from the Human Body Facts niche...

Human Body Facts

Most of the time you only breathe through one nostril at a time, and the

Human Body Facts

Your skin accounts for an amazing twelve percent of your body weight

Human Body Facts

You actually see with your brain, not your eyes. Our eyes function like

Human Body Facts

Newborn babies can see objects about 8-15 inches away most clearly

Human Body Facts

Eyes contain around 107 million light-sensitive cells

Human Body Facts

Your brain uses about the same amount of power as a ten watt bulb