Fun Fact #1
You're completely blind for about 40 minutes a day. When your eyes move , your brain purposely blocks your vision, which is why you can't see the motion of your own eyes in the mirror. It's called Saccadic masking , and without it your life would be like watching a constant movie that's filmed with a shaky, handheld camera.
Fun Fact #2
Human eye can distinguish 500 shades of grey. Your retina's light and dark detecting rod cells see an astounding range of grey. It takes light-sensitive newborns about 4 weeks to open their pupils enough to do this.
Fun Fact #3
The largest eyes on land belong to the ostrich and are 2 inches in diameter. The largest eyes at sea belong to the giant squid an are about the size of your dinner plates.
Fun Fact #4
The lens in your eye is faster than any camera. In every eye, behind the pupil is a lens that is there to focus on objects that we are looking at. Every time you see objects in a space at varied distances, your eye automatically focuses without you even noticing . Now think how long it takes for a camera to perfectly focus. If human eye was a digital camera, it would have 576 megapixels.
Fun Fact #5
The only part of the body that has no blood supply is the cornea in the eye. It takes in oxygen directly from the air.