FACTS ABOUT YOUR EYES

EYE COLOUR CAN CHANGE

Neither blue nor green pigments are ever present in the human iris or

ocular fluid. Eye colour is therefore something like the sky, it depends

on the lighting conditions, especially for lighter-coloured eyes.

IF YOUR EYES ARE BLUE, YOU SHARE A COMMON ANCESTOR

WITH EVERY OTHER BLUE-EYED INDIVIDUAL IN THE WORLD

The very first person to ever have blue eyes lived around 6,000 to

10,000 years ago. Back then, everyone had brown eyes.

EACH EYE CONTAINS 107 MILLION CELLS AND

ALL ARE LIGHT SENSITIVE

Seven million “cones” helps you see colour and detail while the

100 million “rods” help you distinguish black and white. So, less than a

tenth of your visual receptors actually detect colour.

20/20 VISION = NORMAL VISION

This number is largely arbitrary but eye doctors determined that

people ought to be able to read a chart from 20 feet away. This is

normal vision under normal lighting conditions.

IF YOU WEAR GLASSES THAT FLIP IMAGES UPSIDE DOWN,

YOUR BRAIN CORRECTS YOUR VISION

Even though you’d see things upside down, your brain will eventually

adapt and you will begin to function as though you are seeing things

right side up (even though you’re really not). There have been

several experiments done on this.

THE EYES BLINK ON AN AVERAGE OF 17 TIMES PER MINUTE,

14,280 TIMES PER DAY AND 5.2 MILLION TIMES A YEAR

Fun fact: you blink more when you’re talking than while you’re reading,

We’re not sure about singing though…

PEOPLE SAY “IN THE BLINK OF AN EYE” BECAUSE IT’S

THE FASTEST MUSCLE IN THE BODY

A blink usually lasts 100 to 150 milliseconds and it’s possible to

blink five times in a second.

YOU’LL NEED READING GLASSES WHEN YOU’RE OLDER

For around 99% of the population, the age they’ll first need reading

glasses is between 43 and 50. This is because the lens in your eye

slowly loses its focusing ability with age.

THE EYE’S LENS IS QUICKER THAN ANY CAMERA’S

Right behind the pupil is the lens, which focuses on objects

you look at. Take a moment to look around a room and think about

the various distances you’re focusing at. Each time, you do this,

your eye’s lens instantly changes focus without you even being aware of it.

Compare that with a camera’s lens which takes a few seconds to focus

between this distance to the next.