As one of the most
complex organs on the human body, the eye continues to surprise over and over
again, as scientists find out more about it. From pupils expanding at the sight
of someone you love, to 500 visible shades of grey, find out more about the eye
than you ever knew before!
1.
Despite the amount of
noise a new-born baby makes, they can’t actually produce tears when they cry:
their tear ducts don’t start working until they are between 4 – 13 weeks old.
2.
Both eyes have a blind
spot on the back of the retina where the optic nerve attaches, however you
won’t notice this, due to the way eyes work together to fill gaps in your
vision.
3.
Everyone around the
world with blue eyes shares a common ancestor: the first person with blue eyes
lived around 6,000 – 10,000 years ago, and before that, everyone had brown
eyes.
4.
If you wore glasses
that flipped images upside down, your brain would eventually correct your
vision, and you’d see things the right way up.
5.
Some eye surgery uses
shark corneas, as they are the most similar to a human cornea.
6.
Your nose runs when
you cry due to tears from your eyes draining into the nose.
7.
Mascara wands cause
the most injuries out of any cosmetics.
8.
The muscles that move
the eyes are the fastest and strongest muscles in the body: they are 100 times
more powerful than necessary.
9.
You blink more when
you talk, and less when you’re reading off a computer screen or paper – the
reason behind why your eyes get tired more.
10.
People generally read
25 times slower on screen than on paper.
11.
The human eye can see
500 shades of grey.
12.
New-born babies are
colour-blind, and men are more predisposed to colour-blindness than women.
13.
Retina scans are being
used more for security purposes: the fingerprint has 40 unique characteristics,
whereas an iris has 256.
14.
Pupils increase their
size under the effect of strong emotions, such as attraction, disgust and
interest.
15.
The eye has amazing
healing powers: it can filter out dust, dirt and heal scratches in under 48
hours.
16.
Eyes are the second
most complex organ in the body, after the brain.
17.
The function of tears
is to keep the eye clean, but scientists haven’t yet worked out why we cry when
we’re upset.
18.
One blink usually
lasts around 100 – 150 milliseconds, and we blink 5.2 million times a year on
average.
19.
Over 10 million colour
hues can be detected by the eye, but it can’t pick up ultraviolet or infrared
light.
20.
Around half of the
brain is used for seeing and vision.
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