Do You Know These 10 Amazing Facts About Eyes?

  • By Germaine Shock
  • 21 Oct, 2016

It’s no mystery that your sight is one of your most precious features. However, your eyes themselves and the science behind your vision are full of some pretty interesting and even mysterious facts. For example, did you know that your corneas (the clear, protective, outer layer on each eye) are the only tissues that not only don’t have blood vessels, but don’t require blood at all? If you think that’s neat, keep reading for even more amazing facts about eyes.

1. Upside Down & Backwards

Your retinas (the surface at the back of your eyes that is responsible for sending and converting light signals to your brain) actually perceive images upside down and backwards! Your brain thankfully receives these images and inverts them to their proper orientation. Basically, this distortion allows our eyes to view things much larger than our pupils and also gives us our peripheral vision. Without this wacky process, we would only have a very limited view of the world around us (imagine looking through a straw).

2. Blue Eyed Mutation

Ever wonder why brown eyes are so common? All humans originally had brown eyes. According to Live Science , blue eyes appeared as a mutation between 6,000 and 10,000 years ago, but before this they simply didn’t exist. The mutation affected the OAC2 gene which is responsible for the production of color in our hair, skin, and nails.
photo of blue eye
3. Crocodile Tears

Tears actually have different biological compositions depending on if they’re tears of emotion or just eye irritation. There are three groups of tears including psychic tears that occur when you’re feeling an intense negative or positive emotion, basal tears which are released continuously to keep the eye lubricated, and reflex tears that are a response to an irritant such as dust or other allergens.

A photographer named Rose-Lynn Fisher found this fact so interesting that she documented the microscopic images of different kinds of tears showing the vast difference in each.  

4. Cry Baby

Speaking of crying, while newborn babies no doubt have some of the most powerful cries imaginable, they aren’t actually producing tears. A newborn’s tear ducts are not fully formed until 3-12 weeks of age. Up to this point, their eyes make just enough tears to keep their corneas healthy and lubricated. What’s even more interesting, is that despite their inability to produce emotional tears, their eyes do exhibit reflex tearing (a reaction to any irritants such as dust or onion vapors).
photo of baby crying without tears
5. In The Blink Of An Eye

Most everyone has heard the saying “in the blink of an eye”, referring to something being extremely fast. This phrase couldn’t be more accurate. The muscles responsible for controlling your blink are actually the fastest in your body. In fact, a blink only lasts 100-150 milliseconds making it possible to blink up to five times in one single second!

6. Sobr-eye-ity Test

A study performed by the University of Vermont has shown a link between eye color and alcoholism. Those with lighter colored eyes showed a higher incidence of alcoholism when compared to brown eyes, with blue eyes showing the highest association. While scientists emphasize that more research is needed to explain the correlation, they have found that the genetic sequences that control eye color  and those linked to alcoholism are in close proximity to one another and even line up along the same chromosome.

7. Lucky Color Green

Consider yourself lucky if you’ve been blessed with green eyes. Green eyes are by far the least common eye color. In fact, only around two percent of the population have them. The green color occurs as a result of having lower levels of black melanin and higher levels of yellow melanin (melanin is the pigment that makes skin tan and hair and eyes dark). Conversely, eyes without melanin appear blue, and eyes with a higher amount of black melanin appear brown.
photo of green eye
8. Size Matters

Ever notice how big and cute baby’s eyes seem? This is probably because babies are born with their eyes more or less fully grown! While eyeballs do continue to grow after birth, it is such a small amount that it is barely noticeable. The eyes actually grow the least of any other body part and stop growing around puberty, unlike your nose and ears which will grow your entire life.

9. Urban Myth

Ever heard the scary stories about a contact lens moving around and becoming trapped behind someone’s eye? Well, you can rest easy because that one is fortunately just an urban myth. Thanks to the conjunctiva - the thin moist lining of the eyelid - nothing can just slip undetected to the back of your eye. This is because the conjunctiva not only lines the eyelids, but also folds back and becomes the outer covering of your sclera (the white part of your eye) forming a continuous layer and barrier against rogue contact lenses.

10. Show Me Your Eye-D

Most of us have seen the movies and television programs where a top-secret agency has its employees look into an iris or retinal scanner as an ultra secure method of identification. But do you know why this is considered a preferred method over thumbprint verification? While thumbprints have around 40 unique characteristics, irises have over 200! Each ridge, fold, and color variation of the iris is completely unique to its owner and the error rate of these scans is only about one in a million.

If you find these 10 amazing eye facts as interesting as we do, be sure to share this on Facebook! Do you know any other amazing eye facts? Feel free to share them with us in the comments below.


By Germaine Shock 06 Dec, 2017

Do your friends often comment on your ‘unique’ choices when it comes to matching colors and patterns? Being fashionably challenged might not be entirely your fault (or it could be). You might be having an extra difficult time due to color blindness.

Color blindness is actually somewhat of a misuse of the word as those affected by the condition can actually still see color - just with a more limited palette. Color vision deficiency is actually the more accurate term. However, there is a rare form of color vision deficiency known as achromatopsia where you are in fact completely devoid of color in your world- but we’ll get to that one a little later. For now, let’s start with the basics.

By Germaine Shock 01 Aug, 2017
By now most all of you have likely seen or are at least familiar with a solar eclipse. Without getting into too much of the scientific details, a solar eclipse happens when the moon moves between the sun and earth during its orbit causing a partial or complete blockage of our view of the sun. Although a solar eclipse only lasts for a few minutes, its thrilling impact will stay with you for much longer.
By Germaine Shock 20 Jul, 2017
School's out for summer! With a little extra free time and flexibility in your schedule, now is the perfect time to  bring your kiddos in for their eye health exams. Most parents will logically assume that since their child hasn’t had any complaints, they must not be having any problems - or that their child is simply too young to need an eye exam. Think again! 
By Germaine Shock 06 Jul, 2017
Sometimes when it comes to kiddos, you’ll find yourself navigating through some gray areas. For example, determining how much screen time is too much - or how old they should be to watch that scary movie. These definitive numbers are so hard to pinpoint simply because no two children are the same. They all mature at different rates, and we as parents have to adjust accordingly. Fortunately, here are a few tips to help in one of those gray areas -  figuring out if your child is ready for contact lenses.
By Germaine Shock 23 Jun, 2017
We have all made a questionable decision or two at least once in our lives. However, when it comes to your eyes and vision, this is one area where it is always better to be safe than sorry. Here are a few of the most common mistakes made by contact lens wearers and a safer alternative to keep those peepers healthy.
By Germaine Shock 14 Jun, 2017

More than likely if you are reading this, you’ve experienced the strange sensation of an eyelid twitch. It can happen anywhere, at any time, and almost always stops the moment you try to point it out to someone else (and of course resumes the second they turn away just to make you look extra crazy). Well you aren’t crazy - at least in this case - eyelid twitches are a real thing!


Better known in professional lingo as “myokymia”, this twitching sensation is the result of involuntary, spontaneous, rippling muscle contractions. These spasms can actually occur in almost any of the muscles in your body. When relating to the eyelids, myokymia is most common in your lower lids but can happen in your top lids as well.

Eyelid myokymia is typically very temporary. The twitching will usually only last for a few minutes, but in some rare cases can last for a few days or even weeks.

Your doctor will likely advise you that there is no cause for concern as common Myokymia resolves on its own without the need for treatment. Other than causing mild annoyance, the eyelid twitching shouldn’t cause any long term complications or interference with your vision.
By Germaine Shock 01 Jun, 2017

Do your eyes ever feel dry and itchy? Do you ever experience eye fatigue, redness, blurred vision, or excessive watering? You could be suffering from dry eyes - especially if you live in Oklahoma City which ranks as the 17th driest city in the U.S. And despite the name, dry eye isn’t just an annoying feeling - it’s a legitimate chronic eye disease that affects an estimated 4.88 million Americans over the age of 50 alone. And since another estimated 89% of the population have never even heard of Dry Eye Syndrome, it’s easy to see why some would just write off those annoying symptoms as a normal part of their lives.

By Germaine Shock 16 May, 2017

In honor of Mother’s Day kicking off Women’s Week, the Eye- Q blog has decided to dedicate a post solely to women’s eye health related issues. So what makes women’s eye health so special? Women are actually more commonly affected than men by a number of ocular health issues including dryness, cataracts, age related macular degeneration, and complications from autoimmune disorders such as Sjogren's or lupus. Furthermore, according to Prevent Blindness America, 66% of people who are blind or visually impaired are women.

Let’s start with that statistic - why are women more at risk for eye complications than men?
By Germaine Shock 05 May, 2017
May is healthy vision month - and as we draw nearer to the official first day of Summer, what better time to discuss one of the most commonly overlooked parts of eye health - UV protection. Most of you are probably fully aware of the negative effects UV rays can have on your skin, but did you know the sun can be just as damaging to your eyes?
By Germaine Shock 25 Apr, 2017

No, it’s not a typo. Sjogren’s - pronounced show-grins - is a type of autoimmune disorder that causes inflammation and damage to various parts of the body; most commonly the tear and saliva glands. This damage results in symptoms ranging from dryness and discomfort to difficulty swallowing and can even affect the lungs and kidneys.

So why exactly does this happen? Let’s start with a quick health lesson. The immune system is responsible for fighting disease and killing harmful viruses and bacteria. However, with autoimmune diseases, your immune system has a hard time knowing when to stop fighting and mistakenly attacks your own body. With Sjogren’s, your exocrine glands - the glands that secrete moisture such as saliva, sweat, tears, breast-milk, gastric mucous, etc - become the main targets.
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