FACTS ABOUT YOUR EYES
Added on: 16th Feb 2015
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.