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10 incredible facts about the human eye

10 incredible facts about the human eye

1. The color of your eyes is unique

Like fingerprints, the colors and patterns within the iris, or colored part of the eye, are unique—so unique, in fact, that iris scanning is considered more reliable than fingerprint recognition technology. fingerprints). Even identical twins who share DNA do not have identical irises.

2. Your mood affects what you see

When people who suffer from depression They say the world seems dull, drab or grey, this may be more than a metaphor. Research shows there are measurable differences in how the eyes of people with severe depression perceive contrast, supporting the idea that mental health can affect how we see our surroundings.

3. Most people can see a million colors

Scientists estimate that the average person can see at least one million colors thanks to the cone cells in the eye, which send signals to the brain that allow us to perceive different shades. If that sounds impressive, keep in mind that people with a rare abnormality called tetrachromatism have one extra cone cell and, as a result, can see up to 100 million colors.

4. The cornea has no blood vessels and heals quickly

The cornea is the transparent layer that covers the front of the eye and, unlike other parts of the body, does not have its own blood supply (but receives oxygen from the air). However, the cornea does have nerve endings, so scratch your eye It can hurt quite a bit. Fortunately, most abrasions heal quickly, within 24 to 72 hours.

5. When you're awake, you spend 10% of your time blinking.

Blinking keeps your lubricated eyes and protects them from dust and impurities, which could explain why we blink so much: the average person blinks 15 to 20 times a minute, or 14,400 to 19,200 times a day. This is equivalent to 10% of the time you spend awake or more than 5 million times a year.

6. Color blindness is more common in men

About 1 in 10 men have some type of color blindness , or color vision deficiency, which often causes difficulty distinguishing red from green tones. Less commonly, some people cannot differentiate between blues and yellows.

7. We see with the brain

Sight does not only depend on what the eyes see. The eyes capture visual information, but more than 30 areas of the brain process it. Optical illusions, for example, occur when the brain incorrectly interprets what your eyes see or creates a new image that does not exist.

8. Green eyes

It is estimated that only 2% of the population has green eyes, making them the rarest in the world .

9. Smoking affects eyesight

Smoking negatively affects your vision. Increase your chances of suffering from cataracts and/or macular degeneration, especially as you get older.

10. Heterochromia

It refers to a condition in which the eyes are a different color. This can be total, involving one eye of each color, or partial, meaning that in both irises we can find a section of a color clearly differentiated from the rest of the set.

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