do-you-know

 

The world’s most common eye colour is brown.

You see with your brain, not your eyes. Our eyes function like a camera, capturing light and sending data back to the brain.

We have two eyeballs in order to give us depth perception – comparing two images allows us to determine how far away an object is from us.

Your eyes become tired when you read or stare at a computer, this is because you blink less often.

Eyelashes have an average lifespan of five months.

The cornea is the only tissue in the human body which doesn’t contain blood vessels.

20/20 vision simply means that you have normal vision.

The human eye can function at 100% at any given moment, without needing to rest.

Smoking reduces your night vision.

The human eye can see 500 shades of grey.

It is reported that men can read fine print better than women can.

Eye colour is determined by the amount of melanin in your iris.

Diabetes can cause blindness.

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