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Eye Facts that Answer Common Questions About the Eyes

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Eye fact or eye myth? Find out if what you believe about your eyes is fact or fiction. A VSP eye doctor sets the record straight on 5 common eye myths.

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Green eyes are caused by a small amount of pigment with a golden tint and are most often found in northern and central Europe and western Asian cultures.

Brown eyes are the most common in the world. An estimated 55 percent of the world's population has brown eyes and, in some people, the eyes are so dark that they appear black. Around 8 percent of the world's population has blue eyes and between 5 and 8 percent of people have hazel eyes.
Learn more about Human Anatomy

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What is the rarest eye color in the world?

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Green eyes are caused by a small amount of pigment with a golden tint and are most often found in northern and central Europe and western Asian cultures. Brown eyes are the most common in the world. An estimated 55 percent of the world's population has brown eyes and, in some people, the eyes are so dark that they appear black.

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How The Human Eye Evolved To Be So Complex

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Eyes are so complex that some say natural selection couldn't possibly be how they formed. So, how did eyes evolve? These Eye Floaters Live Inside You! ►►►► http://bit.ly/1YrEaWQ Get Awesome DNews Science Shirts!

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The giant squid remains largely a mystery to scientists despite being the biggest invertebrate on Earth. The largest of these elusive giants ever found measured 59 feet (18 meters) in length and weighed nearly a ton (900 kilograms).

However, their inhospitable deep-sea habitat has made them uniquely difficult to study, and almost everything scientists know about them is from carcasses that have washed up on beaches or been hauled in by fishermen. Lately, however, the fortunes of scientists studying these elusive creatures have begun to turn. In 2004 researchers in Japan took the first images ever of a live giant squid. And in late 2006, scientists with Japan's National Science Museum caught and brought to the surface a live 24-foot (7-meter) female giant squid.

Giant squid, along with their cousin, the colossal squid, have the largest eyes in the animal kingdom, measuring some 10 inches (25 centimeters) in diameter. These massive organs allow them to detect objects in the lightless depths where most other animals would see nothing.

Like other squid species, they have eight arms and two longer feeding tentacles that help them bring food to their beak-like mouths. Their diet likely consists of fish, shrimp, and other squid, and some suggest they might even attack and eat small whales.

They maneuver their massive bodies with fins that seem diminutive for their size. They use their funnel as a propulsion system, drawing water into the mantle, or main part of the body, and forcing it out the back.

Scientists don't know enough about these beasts to say for sure what their range is, but giant squid carcasses have been found in all of the world's oceans.

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Giant Squid, Giant Squid Pictures, Giant Squid Facts - National Geographic

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The giant squid remains largely a mystery to scientists despite being the biggest invertebrate on Earth. The largest of these elusive giants ever found measured 59 feet (18 meters) in length and weighed nearly a ton (900 kilograms).

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Image: johnmuk

10. Owls
Mesmerising!
While humans tend to only think about their own vision and eyesight, eyes work in all kinds of different ways, allowing some animals to see in ways that humans can only imagine. Here are a few things you should know about a few animals with highly specialized eyes.

Like many predators, owls have their eyes located together in the front of their face, which allows them excellent depth perception during their hunting expeditions -particularly in low-light situations. Interestingly though, these massive eyes are fixed in their sockets and can barely move. This is why the owl can turn its head so far.

Image: Rachaelwrites

9. Geckos
Macro of my gecko's eye
Nocturnal geckos have to be able to block out the bright sun during the day while still retaining excellent night vision, which is why they have long zig-zagged pupils that can tightly constrict to let in only pinpoints of light. Interestingly, while humans cannot see colors in dim moonlight, these animals can discriminate between colors and their eyes are calculated to be almost 350 times stronger when it comes to seeing color.

Image: Dotmartin

8. Gharials

Gharials are ancient creatures that are practically living fossils. Despite this, they have extremely well-evolved eyes that are located in such a way that they can keep almost their entire head underwater and leave their eyes out to look out for prey. Their eyes are also primed for night vision, as a thin, mirror-like structure at the back of their eye helps reflect light that was not already absorbed by the eye back into the eye a second time. When lights are shown on the creatures at night, their eyes will reflect the light so brightly that it looks like they are glowing.

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10 Most Incredible Eyes in the Animal Kingdom

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Image: johnmuk 10. Owls Mesmerising! While humans tend to only think about their own vision and eyesight, eyes work in all kinds of different ways, allowing some animals to see in ways that humans can only imagine. Here are a few things you should know about a few animals with highly specialized eyes.

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How does the eye actually work?

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Most people know that dogs don't see as well as humans, but there are a lot of misconceptions floating around about the way they see the world. But now a small web app, first uncovered by The Next Web, can show you how the world looks through your pooch's eyes.

Dogs, contrary to popular belief, do not see the world in black-and-white. Their vision is actually most similar to people with red-green colour blindness. But there are other ways humans differ from dogs as well, including less sensitivity to both brightness and variations in shades of grey.

Dog Vision tries to take these factors into account. Simply upload a photo and in a few moments the app will show you how your dog would see that scene. Here are a few ways the photo will change.

Colours: Humans (and dogs) have two types of colour receptors: rods and cones. Rods handle peripheral and night vision - brightness and shades of grey. Cones deal with day vision and colour perception. Each of the cones detects a different wavelength of light, and through using our three types of cones, humans can detect a full spectrum of hues (in a similar way to how you mix primary colours in paint). Dogs only have two types of cones (like red-green colourblind humans), and this makes their colour vision very limited.

A vibrant Mardi Gras scene, as humans see it, changes from this:

To this when viewed by a dog:

Near-sightedness: Dogs are also very nearsighted compared to humans. A special test, custom-made for dogs, puts them at around 20/75 vision, according to Psychology Today. This means a human could barely see at 23 metres (75 feet) is what a dog can just about make out at 6 metres (20 feet). That's why this scene of matadors turns from this in a human's eyes:

Into this in a dog's eyes:

Brightness discrimination: Dogs are substantially worse than humans at determining difference in brightness, or looked at another way, different shades of objects. In fact, dogs are twice two times worse at differentiating between shades than humans are. That's why this photo of fall foliage changes from this:

Into this when a dog sees it:

But if you start to get sad for the pups, just remember your dog has an incredible sense of smell that basically lets it 'see' the world in different scents.
This article was originally published by Business Insider. More from Business Insider:

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How Dogs See the World Compared to Humans

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Most people know that dogs don't see as well as humans, but there are a lot of misconceptions floating around about the way they see the world. But now a small web app , first uncovered by The Next Web , can show you how the world looks through...

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Curious adults from California, Pennsylvania, Kentucky, and the United Kingdom July 2, 2004 These are excellent questions. People are often very confused by eye color genetics because reality seems to fly in the face of the simple genetics we are

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Genetics Eye Color

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Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on YouTube.

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Why do people have different types of eye color?