The Human Eye

Unbelievable Natural Facts

There are unbelievable facts about one of the most complex organs, the Human Eye, the incredible natural camera, that we visualize our world.

Even as you read this, your eyes are working at an incredible pace and doing it silently and stealthily. The human eye is one of the most complex organisms in the human body – second only to the brain. The human eye is the most valuable and sensitive sense organ,and it is a natural optical instrument.

Despite being just over two centimeters in diameter, human eyes have over 2 million moving parts. They can distinguish over 500 shades of grey, and over 2.7 million colors.

Here are some interesting facts about our eyes.

12. Nearsighted - Farsighted

If you're shortsighted, your eyeball is longer than normal. If you're farsighted, it's shorter than average. Nearsighted or shortsighted, the eyeball is longer than normal and you can see closer or nearer but further out, it gets blurry. Nearsightedness or myopia is a refractive defect of the eye lens in which the image is formed in front of the retina not on it. Farsightedness or hyperopia is a defect of vision in which closer objects appear to be blurred. It occurs because the eyeball is too short and the lens has incorrect curvature or the cornea is flat.

11. Blink

On average, a person blinks 17 times a minute, 14,280 times in a 14-hour day, and 5.2 million times a year. Blinking is a natural process whereby the eyelids wipe off the tears that are perpetually made by the tear glands located at the corner of our eyes. This helps in clearing of our vision and additionally it keeps our eyes damp and clear. Blinking of our eyes prevents the entry of mud particles and will the lubrication of eyeballs. Lubrication is finished via mixture of oils and secretion that are secreted throughout the blinking of the eyelids.

10. Men and women see colours differently

Men and women really don't see eye to eye, according to a new study. The male and female brains process colors in slightly different ways. This means that if both sexes look at an orange, it will appear redder to the man than to the woman. Similarly, grass looks yellower to a man and greener to a woman. Men also struggle to distinguish subtle differences in shades of yellow, green and blue.

9. The retinas cannot detect red.

Although your retinas have red, green and blue colour receptors, the "red" receptor only detects yellow-green, and the "green" receptor detects blue-green. Your brain combines these signals and turns them into red.

8. Distinguish millions of colors

The human eye is an incredible organ. It can distinguish about 10 million different colors. The three primary colours – red, green and blue makes up the millions of colors distinguishable to the human eye.

Each eye contains three receptors and each primary colour, are responsible for the creation of the experience of color, when stimulated in various combinations known as, the Young-Helmholtz Trichromatic Theory. It follows that those who have defective cones cannot see certain colours and are known to be color-deficient.

7. Red Eye

We can get ‘red eye’ in photos because the flash reflects off of the blood vessels in our retinas. When taking photographs, if light reflects off of the blood vessels in our retinas, it gives us devilish, red-tinted eyes.

In dogs and other animals, eyes look green because they have an extra layer of cells behind their retinas. To make sure you never ruin another picture with ‘red eye’ try to shoot at an angle so that the light source is not directly above your camera.

6. Does Carrots improve your eyesight?

Are carrots truly able to improve eyesight? Yes, under certain conditions, eating carrots can help improve eyesight. The body uses beta-carotene to make vitamin A, and vitamin A is really important, which is important for healthy eyesight, skin, growth, and resisting infection.

But unless you are deficient in vitamin A, carrots don’t make your eyesight better. In an effort to conceal a new “cutting edge” technology, the British Royal Air Force during World War II started a rumor that the pilots ate a lot of carrots, which allowed them to see better at night.

5. Green eyes

Green-eyed people make up 1-2% of the entire human population, and naturally occurring violet-colored eyes also exist. Green eyes contain the yellowish pigment lipochrome. However, very few people that carry the gene are responsible for green eyes, so the number of blue-eyed people greatly outnumber those with green eyes.

Even rarer than green eyes are violet eyes which are steeped in lots of mystery although "true" violet-colored eyes occur only due to albinism.

4. Blind Spots

Both our left and right eyes have independent blind spots. The blind spot is the area on the retina without receptors that respond to light. Therefore an image that falls on this region will NOT be seen. It is in this region that the optic nerve assist the eye on its way to the brain.

Try this Test: To find the blind spot of the right eye, close the left eye and focus the right eye on a single point. See if anything vanishes from vision some 20 degrees right of this point.

3. How far can the human eye see?

A candle burning 1,286 feet away has the same level of brightness as the brightest stars in our sky, according to new research. The candle would disappear from view at around 1.6 miles, not 10 or 30 miles as has been previously suggested

2. Blue eyes are recent

Originally, everyone had brown eyes. It appears that a genetic mutation in a single individual in Europe thousands of years ago led to the development of blue eyes, according to researchers at the University of Copenhagen. Eye color depends on the amount of a single type of pigment (called melanin) in the iris of the eye. This genetic switch, located in the gene next to the OCA2 gene, limits the production of melanin in the iris, effectively "diluting" brown eyes to blue.

It has been conclude that all blue-eyed individuals are linked to the same ancestor, as they have all inherited the same switch at exactly the same spot in their DNA.

1. Muscle of the human eye

The focusing muscle of the human eye moves about 1000,000 times every day. On an average, this spectacular muscle of the human eye moves about 1000,000 times every single day. If that doesn’t blow your mind, let’s put it in perspective. For your leg muscles to get the same kind of workout, you would have to walk 50 miles, every day.

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