10 Things You Probably Didn't Know About Your Eyes
1. The space between your eye brows is called a Nasion
2. Your retinas actually perceive the outside world as upside-down – your brain flips the image for you.If you want to see the world as your retinas do, try a pair of prism glasses. Just don’t operate heavy machinery while wearing them.
3. In addition to being upside-down, images arrive at your retina split in half and distorted.Each half of your brain receives one half of the image, and then they scramble the images together to compose the whole picture you’re used to seeing.
4. Your peripheral vision is very low-resolution and is almost in black-and-white.You don’t realise it because your eyes move to “fill in” the peripheral detail before you notice the difference.
5. On average, you blink 17 times a minute.That’s 14,280 times in a 14-hour day, and 5.2 million times a year.
6. Your eyes are almost the same size as they were when you were born. And newborn babies can see clearly up to 15 inches away.Which is, handily, generally where their mothers’ faces are when they’re breastfeeding.
7. Your tears have different compositions based on whether something’s irritating your eye, or you’re crying, or yawning.
8. Your eye is constantly making tiny jerking movements called “microsaccades” to stop objects from fading from your vision. A process called Troxler’s phenomenon causes static objects in your gaze to disappear if you stare at them for too long. Microsaccades stop this from happening.
9. The human eye can distinguish about 10 million different colours
10. We spend about 10% of our waking hours with our eyes closed, blinking.