The human eye is a complex and fascinating organ. The processes that take
place between your eyes and your brain to allow you to see images and
colors are enough to leave anyone in awe.
Here are 10 amazing facts about the human eye you might not know:
1. The human eye contains more than two million operational parts that
process up to 35,000 bits of information every hour. It is one of the
most complex organs in the body, second only to the brain.
2. Unlike all other tissues in the eye, the cornea does not require blood.
The presence of blood vessels in the cornea would interfere with vision.
The cornea receives oxygen and nutrients from other parts of the eye,
including tear fluid and the thick, watery substance between the lens
and the cornea.
3. The strongest muscles in the body—strongest in relation to the
job the muscles are required to do—are the eye muscles. These muscles
are so strong because they are constantly moving to readjust the position
of the eyeball.
4. The retina sees everything backwards and upside-down. When the brain
processes that information, it flips it for you so the image you see is
correct. Images also arrive to the retina split in half—each half
of the brain receives part of the image and then reassembles the information
to compose the image you see.
5. The saying “the eyes are the window to the soul” applies
to humans, and in a way, it also applies to dogs, but no other species.
Both humans and dogs seek visual cues by looking into the eyes of another—interestingly,
dogs only do this when interacting with humans.
6. If you have blue eyes, you share a common ancestor with every other
blue-eyed person in the world! All humans had brown eyes until someone
developed a genetic mutation that caused their eyes to appear blue.
7. About 2 percent of women can see 100 million colors. This is due to
a rare genetic mutation that gives them an extra retinal cone in their eyes.
8. Human tears do not evaporate because they are made of more than just
water. The three main components of tears are oil, mucous and water.
9. Every eye has a tiny blind spot in the back of the eye where the optic
nerve attaches to the retina. You don’t notice this blind spot because
your eyes work together to fill in the gaps.
10. A fingerprint has 40 unique characteristics, but the eye has 256! This
is why retina scanning is becoming more commonly used for security purposes.
Your eyes are incredible. Keep them strong and healthy with routine eye
exams to prevent and detect eye conditions that can damage your eyes and
cost you your vision.