There is one optic nerve in the eye. It is also known as cranial nerve II.
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People with working eyes, optic nerves and optical centers in their brains observe anything that is within their line of sight that catches their attention.
Nerves are pretty small. Consider that the human spinal cord, with its many, many nerve pathways, is under 10 mm in diameter at it widest point. Individual nerves have diameters ranging from perhaps 4 to 100 micrometers, depending on the location.
790 as you count in the eyes of the cows.
In the United States, one out of every six whites have blue eyes.
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