1. The color of your eyes is unique
Like fingerprints, the colors and patterns within the iris, or the colored part of the eye, are unique (in fact, so unique that iris scanning is considered more reliable than fingerprint recognition technology). Even identical twins who share DNA don't have identical irises.
2. Your mood affects what you see
When people suffering from depression People say the world seems dull, monotonous, or gray—this may be more than a metaphor. Research shows 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 a million colors thanks to the cone cells in the eye, which send signals to the brain that allow us to perceive different hues. If that sounds impressive, consider that people with a rare condition called tetrachromatism have an 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, it 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 be quite painful. 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 between 15 and 20 times per minute, or between 14,400 and 19,200 times a day. This equates to 10% of your waking time, or more than 5 million times a year.
6. Color blindness is more common in men
Approximately 1 in 10 men has some form of color blindness , or color vision deficiency, which often causes difficulty distinguishing between red and green hues. Less commonly, some people can't differentiate between blue and yellow.
7. We see with the brain
Vision doesn't just 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 doesn't 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 your eyesight
Smoking negatively affects your vision. It increases your chances of developing cataracts and/or macular degeneration, especially as you get older.
10. Heterochromia
It refers to a condition in which the eyes are different colors. 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.
