About half of Americans born at the turn of the 20th century had blue eyes. Today, only about 1 in 6 Americans has them.
Some lizards squirt blood out of their eyes as protection against predators.
Humans and dogs are the only two species known to seek visual clues from another's eyes. And dogs only do it with humans.
Eigengrau (“brain gray”) is the color your eyes see in total darkness.
People with blue eyes have a higher alcohol tolerance.
If the human eye was a digital camera it would have 576 megapixels.
Dolphins sleep with one eye open.
Goldfish can't close their eyes as they have no eyelids.
An Ostrich's eye is bigger than its brain.
Your eyes can get sunburned.
Bees have five eyes.
Blue eyes tend to be more sensitive to light.
Even without moving their eyes, some birds have a 360-degree field of view.
2.5 billion people are living with poor vision unnecessarily because they do not have corrective eyewear.
Cats have three eyelids.
U2 singer Bono wears sunglasses all the time because he suffers from glaucoma, an eye condition.
Night vision goggles are green because the human eye can differentiate more shades of green than any other color.
All blue eyed people can be traced back to one person who lived near the Black Sea almost 10,000 years ago.
The human eye can distinguish about 10 million different colors.
Researchers have successfully used the game TETRIS to treat "lazy eye" in adults.
Black lemurs are thought to be the only primates, besides humans, to have blue eyes.
The eye of a giant squid can measure the same as a volleyball ball.
Professional baseball players have an average visual acuity of 20/12, much better than the "good" 20/20 vision most people have.
The world economy falls short of $227 billion every year from lost productivity among adults who need glasses.
It is impossible to sneeze with the eyes open.
There's a laser procedure to change one's eye color from brown to blue, as blue eyes exist under all brown eyes.
The cross-eyed silent-film comedian Ben Turpin had his eyes insured for US$100,000 against uncrossing.
Ommatophobia is the fear of eyes.
Carrots don't make your eyesight better. That was a lie from the British to cover up their technology from the NAZI during WW2.
We spend about 10% of our waking hours with our eyes closed, blinking.
Some women can have a genetic mutation which causes them to see millions of more colors.
Albert Einstein's eyes remain in a safe box in NYC.
Chameleons can move their eyes in two directions at the same time.
The space between your eyebrows is called Nasion.
Illiteracy and poor vision are related. 3 in 4 illiterate adults failed one or more parts of a vision screening, a report found.
Your eyebrows renew themselves every 64 days.
At birth, a baby's eye is about 75% of the size of an adult eye.
In 2017, British doctors found 27 lost contact lenses in a patient's eye.
It takes about 0.2 seconds for your brain to understand the light that reaches your eye.
Butterflies have 4 eyes, bees have 5 eyes, most spiders have 8 eyes and Caterpillars have 12 eyes.
A rare tumor called a "limbal dermoid" can cause hair to grow out of a person's eyeball.
Myopia is about twice as common in Jews than in people of non-Jewish ethnicity.
In 2014, a student in Taiwan went blind after keeping her contact lenses in for 6 months. A microscopic bug ate her eyeballs.
Women have larger pupils than men.
80% of what we learn is through our eyes.
A human eye can detect a candle flame 1.7 miles (2.76 km) away.
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