Rod and cone cells within the retina enable conscious light perception and vision such as perception of depth and the color differentiation. The human eye can easily distinguish about ten million colors.
Much like the eyes of other mammals, the human eye's non image building photosensitive ganglion cells within the retina receive light signs which impact adjustment of the scale of the pupil, regulation and suppression of the hormone melatonin and entrainment of your body clock.
The eye is not formed like an ideal sphere, rather it is a fused two piece unit. The smaller frontal unit, more curved, known as the cornea is connected to the larger unit referred to as the sclera. The corneal segment is normally about 8 mm (0.3 in) in radius. The sclerotic chamber make up the remaining five sixths; its radius is normally around 12 mm.
The human eye could be compared to a camera that focuses, gathers and transmits light via a lens to generate an image of the surroundings. In a camera, the image is produced on film; in the eye, the image is produced on the retina, a thin layer of light sensitive cells on the back of the eye. The lens of the eye bends or refracts, light that gets into the eye.
The cornea, which is a clear, transparent covering in the front portion of the eye additionally contributes to focusing light on the retina. Nerve fibers extending back through the retina's nerve cells get together behind the retina to make the optic nerve, a cable of nerve fibers linking the eye with the mind.
The optic nerve transmits messages about what we see from the eye towards the brain. Like a camera, the human eye handles the amount of light that gets into the eye via the lens under different lighting conditions.
1) The average individual blinks 12 times for each minute - around 10,000 blinks in an average day
2) Eyes are made up of more than 2 million working parts
3) Just 1/6th of the eyeball is exposed to the exterior world
4) Eyes can process 36,000 bits of information every hour
5) The eyeball of a person weighs around 28 grams.
6) Eyelashes have an average life span of 5 months.
7) About 50 % of our brain is involved in the seeing procedure. Humans are very much visual animals.
8) Your eye will concentrate on about 50 things per second.
9) The exterior muscles that move the eyes are the most powerful muscles in the human body for that job that they have to do. They are 100 times stronger than they need to be.
10) Under the right circumstances, the human eye can see the light of a candle at a range of 14 miles.