The idea for the general principle of a contact lens was made by Leonardo da Vinci in 1508.
Swiss physician A.E. Fick is credited with fitting the first glass contact lens in 1887.
The cornea is the only living tissue in the human body that does not contain any blood vessels.
The cornea has 5 separate layers.
The retina has 10 separate layers.
The little lights you see with your eyes shut are phosphenes, which come about when you shut your eyes tight. This is because the retina is stimulated by pressure on your eyeball.
The space between your eyebrows is called the glabella.
Eyeballs are the second most complex organs you possess, next to your brain.
The eyeball can instantaneously set in motion hundreds of muscles and organs in your body.
Of all the muscles in your body, the eye muscles are the most active.
The adult eyeball measures about one inch in diameter. Of its total surface area, only one-sixth is exposed "“ the front portion.
It can be uncomfortable to sit too close to a television, but your eyes will not be damaged by doing so.
The pupil expands as much as 45% when a person looks at something pleasing.
In a normal lifespan, your eyes will bring you about 24 million images of the world around you.