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

Men produce approximately ten million sperm every single day

Human Body Facts

Albinism affects melanin production; perhaps resulting in extra

Human Body Facts

Your eyes are constantly moving, usually in rapid jerky movements. But

Human Body Facts

Seeing is such a big part of everyday life that it requires about half

Human Body Facts

We have all have unseen, harmless microscopic creatures living in our

Human Body Facts

When your eyes are watering it may be a sign of dry-eye, and your eyes