stackyFACTS
Health

Why camera flashes make your eyes glow red

HERE’S THE INTERESTING PART

That terrifying demonic glow in vintage flash photography is just your own internal anatomy saying hello. The bright flash illuminates the heavily vascular back of your eyeball, bouncing directly into the camera lens. You aren't possessed, you just have translucent eye parts.

Why camera flashes make your eyes glow red
STACKY / Health
One discovery leads to another.

Keep exploring facts in this topic.

Health →
STACKY FOR IPHONE

A bigger world.
One discovery
at a time.

Keep discovering with Stacky. Interesting facts in an app that is always within reach.

Download on the App Store
ONE MORE DISCOVERY?

Keep exploring

All in this topic →
Your retina has 256 identifying features
Health

Your retina has 256 identifying features

Your fingerprint is actually old news when it comes to biological security. While a human fingerprint only has about 40 unique characteristics, the complex…

Discover more
Your eyes were almost full-sized at birth
Health

Your eyes were almost full-sized at birth

The reason babies look so incredibly cute and alien-like is because their eyes are already fully sized for an adult face. While your nose and ears will…

Discover more
You have a tiny leftover third eyelid
Health

You have a tiny leftover third eyelid

That weird little pink triangle in the inner corner of your eye is a tragic monument to millions of years of wasted evolution. Known as the plica semilunaris,…

Discover more
Female humans statistically blink about nineteen times per minute on average, whereas male humans only blink roughly eleven times per minute, according to numerous physiological…
Health

Female humans statistically blink about nineteen times per minute on average, whereas male humans only blink roughly eleven times per minute, according to numerous physiological…

Female humans statistically blink about nineteen times per minute on average, whereas male humans only blink roughly eleven times per minute, according to…

Discover more
The tiny remnant of a third eyelid in your eye
Health

The tiny remnant of a third eyelid in your eye

Other mammals still actively use this completely transparent shield to gracefully blink underwater or successfully block fierce wind. We just strangely have a…

Discover more
Corneal tissue in the human eye is entirely devoid of blood vessels and instead extracts the oxygen it needs to survive directly from the surrounding air.
Health

Corneal tissue in the human eye is entirely devoid of blood vessels and instead extracts the oxygen it needs to survive directly from the surrounding air.

Corneal tissue in the human eye is entirely devoid of blood vessels and instead extracts the oxygen it needs to survive directly from the surrounding air.…

Discover more
StackyMore discoveries in the app
Download on the App Store