#1 No Human Being Has Truly Black Eyes

None of us have truly black eyes, well, unless you get into a fight (if you know what I mean). Some of us do have a lot of melanin so the eye might appear almost pitch black while it’s not. A lot depends on the lighting conditions. In fact, those who are believed to have black eyes just have a really dark brown eye color. There are loads of different shades of brown but the funny thing is that they’re actually blue underneath. Also, all brown-eyed people have the same ancestor as every other blue-eyed person in the world.

#2 An Eyelash Is Here To Stay For Just 150 Days Only

Your eyelashes can change the entire look of your eyes and face. Hence, many women spend hours doing their makeup which also includes curling their lashes and applying tons of mascara. As a woman myself, I love long lengthy lashes but did you know that our eyelashes fall out and completely replenish themselves every 150 days. They re-grow until they reach the optimal length, they then fall off and replenish themselves all over again. Although our shedding cycle varies slightly in terms of length, every set of human eyelashes goes through the same pattern.

#3 Our Eyelashes Are Home To Tiny Mites

Eww… gross. Well, although this might gross you out, it is true. But there’s nothing much to worry about. These tiny mites who live in the base of our eyelashes come out at night to consume cells to prevent the follicles from clogging. But if your lashes aren’t cleaned frequently, these mites can over-populate and cause infections. So, if you ever opt for falsies or false lashes, make sure that the lash adhesive has antimicrobial properties.

#4 Cry As Much As You Want – You’ll Never Run Out Of Tears

People who are extremely emotional and cry at the smallest of things are often asked to save their tears for their big day. And that’s because we all believe that if we cry too much we will run out of tears someday but that’s not true. In fact, every human being creates around 15 to 30 gallons of tears every year, whether you use them or not. While tear production can slow down due to several factors, such as health and age, you don’t actually run out of tears.

#5 Tears Are Made Of Three Different Layers

So complex but so true and quite interesting I must say. Our tears consist of three layers—oil, water, and mucus. The water layer is the thickest and contains electrolytes, proteins, glucose, and other various substances. Various fats that are a part of the outer oil layer help slow down evaporation.

#6 The Human Eye Is Better Than Most Digital Cameras

The coolest camera so far has 200 megapixels but here’s an interesting fact. The human eye is made up of 576 megapixels, and that’s precisely why sunsets appear much better in real life than in photographs taken on a smartphone or digital camera.

#7 Our Blink Frequency Depends On The Task We Do

How often do you think you blink? I bet you must have lost count by now. Don’t worry though, I have all the information you need, right here. The blink frequency, how often and how long we blink differ under various conditions. In general, we blink approximately 8 to 21 times a minute. However, when engaging in more difficult tasks or while having a conversation, the blink frequency can double.

In contrast, when we’re visually concentrating on something, our blink frequency drops. For example, while reading or binge-watching our favorite show on Netflix we blink less, around 4.5 blinks per minute on an average.

#8 An Iris Has More Unique Characteristics Than A Fingerprint

While our fingerprint has 40 unique characteristics, an iris has close to 256 unique characteristics.  This is one of the major reasons why iris scans have replaced fingerprint scanners for security purposes. Most smartphone companies like Samsung and Apple too, have an inbuilt iris scanner that allows the user to unlock their device without having to memorize any passcode. Quick, easy, and extremely secure.

#9 A Tight Necktie Can Increase The Risk Of Glaucoma

Men who tie their neckties too tightly could be at risk of developing a sight-destroying disease called glaucoma. A tight necktie causes an increase in pressure in the eye, which is one of the leading risk factors for this ocular disease. So, if you ever see a patient with raised pressure, it’s worth checking if their tie is too tight.

#10 The Smallest But The Strongest Of All

The muscles in our eyeballs are way stronger than any other muscle in your body. Unlike other muscles that relax while you’re resting or asleep, your eye muscles are constantly at work. This is because our eyes are constantly moving during the REM cycle of our sleep. They’re constantly busy readjusting or moving.