The Optic Nerve is our 'cable' for vision.
It is 40 mm long. It starts as a collection of nerve fibers from the back of the eye, forms a
thick cord and travels from the orbit to the brain.
There are 1 million nerve fibers in
the Optic Nerve.
The speed of impulse transmission in the
nerve is 423 miles/second !
The optic nerve is different from the other nerves, in that it is a direct
extension of the brain.
The area of the retina from where the
Optic Nerve exits, has no visual receptors, therefore image that falls in
this area is not visible. This area is called as the 'Blind Spot'.