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15 Fascinating Facts About Your Eyes You Didn't Know
Why do doctors sometimes use shark corneas in eye surgeries, how many images do our eyes capture in a lifetime, and why do some countries opt for retina scanning over fingerprinting? Discover these eye-opening facts and more.
1. Our corneas are nearly identical to a shark's, which is why they're sometimes used as a substitute for damaged human corneas in modern medicine.
2. While we perceive a wide array of colors, the human eye can actually identify only three colors: red, blue, and green.
3. Our pupils can expand by up to 45% when we look at someone or something we love.
4. Within an average lifetime, a person's eyes capture around 24 million images.
5. The human eye is composed of nearly 110 million cells, all of which share one common trait: sensitivity to light.
6. The iris has 256 unique features compared to a fingerprint, which has only 40. This is why many countries have adopted retina scanning for security and criminal identification, relying less on fingerprints.
7. The expression "in the blink of an eye" isn't just a saying: eye muscles are among the fastest in the body, with a single blink lasting between 100-150 milliseconds - that's at least five blinks in one second.
8. Only about one-sixth of our eyeball is visible from the outside.
9. Color blindness is more common among men, affecting one in 12 males.
10. A human eye can process approximately 35,000 pieces of information every hour.
11. The eye's phenomenal focus ability allows it to concentrate on about 50 different objects simultaneously in just one second.
12. Did you know you can turn brown eyes blue using laser treatment? The reason may lie in the fact that brown eyes have a blue pigment at their core.
13. Our eyes capture images upside down, which are then interpreted by the brain into the right-side-up view we see.
14. Each eyelash lives for about five months before falling out.
15. Hashem endowed eyes with the natural ability to "heal themselves." Thus, if the cornea is damaged, the eye can self-repair the scratch or injury within 48 hours.
