Although we heavily rely on our vision, most of us know very little about how we see the world around us. Over time the human eye has evolved to become our second most complex organ. Even before we are born, we can differentiate between light and dark.
But humans are not the only animals with amazing eyes! From the highest point in space to the darkest depths of the ocean there are all kinds of weird and wonderful eyes that you may not have even thought of. We've put together an entertaining infographic that brings you 8 surprising facts about eyes.
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Tweetable Eye Facts
1. Due to lack of gravity in space, an astronaut cannot cry! Tweet This
In space there is no gravity. This means that if an astronaut feels sad, their tears cannot run down their face. Instead, they form a ball on the face, eventually separating from the eye and drifting around.
2. Your eye is the fastest muscle in your body. Tweet This
Have you ever heard the phrase "in the blink of an eye"? This saying originates from the fact that a blink lasts 100 - 150 milliseconds. Furthermore, the average person blinks between 15 - 20 times per minute.
3. Human eyes start to develop just two weeks after conception! Tweet This
Although a baby can tell the difference between light and dark inside their mother's womb, once born, they can only see a distance of between 8 and 12 inches.
4. An ostrich's eye is bigger than its brain. Tweet This
As the largest bird in the world, an ostrich’s eye is the same size as the whole body of the bee hummingbird (the smallest bird in the world), and 5x bigger than the human eye. Having large eyes helps the ostrich see in great detail so that it can avoid predators in the wild.
5. Goats have rectangular pupils to spot approaching predators Tweet This
Ostriches are not the only animals that need to steer clear of predators. Goats and other grazing animals have to keep a look out so that they are not hunted, which explains why goats have horizontal pupils. This creates a wider field of vision and increases depth perception so that they can anticipate oncoming trouble.
6. Dolphins can move each eye independently Tweet This
Although dolphins are unable to see in colour, they have excellent vision both in and out of the water. Having laterally placed eyes which act independently allows them to process two images at once; for example, when swimming on their side.
7. Goldfish have no eyelids, making them sensitive to bright light. Tweet This
Although goldfish cannot close their eyes, they can actually see more colours than humans. They can also be trained to respond to visual signals and often recognise the person that typically feeds them.
8. The largest eye on the planet belongs to the Colossal Squid Tweet This
The Colossal Squid is well equipped for life in the deep blue sea, with eyes as big as a human head, measuring around 27cm across. This is so that it can see and catch prey and stay away from predators.