Interesting science facts - Eyes

The simplest definition of eyes would be an organ that detects light in a form of very complex optical system.

The simplest types of optical systems that we can call eyes are found in those in unicellular organisms that are capable only to detect whether the environment is dark or light.

Eyes are called complex when they can distinguish the shapes as well as the colors.

In the Cambrian time, roughly 540 millions ago first optical systems arise in some animal species.

Brain is the only organ with more complex system than the eyes.

People depend on eyes for gathering knowledge. Somewhere around 85 % of our total knowledge is connected with eyes as the source of this knowledge.

Person with average life span will experience close to 25 million images in the world around him/her.

Eyes are the only part of the human body that is always 100 % ready to function, eyes do not need rest, what needs rest are your eyelids and external eye muscles.

Eyelashes are natural protection that eyes have against all sorts of dirt, and eyebrows prevent sweat from going directly into the eyes.

Average human eyeball weighs approximately 28 grams.

All babies are color blind in time of their birth.

Average person blinks around 10,000,000 times a year.

An eagle has incredibly sharp vision and can see a rabbit about 1 mile or 1760 yards away.

Bats are actually not blind but very rarely use their eyes and depend on their smell sense to survive.

Infants starts blinking at the age of 6 months.

Human eye can detect 10 million color hues, but still cannot see ultraviolet or infrared light unlike the insects can see the ultraviolet light.

Boys are more likely to develop color blindness than girls are.

Eyes transplantations are still not possible because eyes are connected to the brain by the optic nerve, which cannot be reconnected once it has been removed.

Reading in dim light can make your eyes feel tired, but it is not as harmful as many people believe it is.

Sneezing with your eyes open is impossible.