What is definition of optic nerve?
(OP-tik nerv) The nerve that carries messages from the retina to the brain. Enlarge. Anatomy of the eye, showing the outside and inside of the eye including the eyelid, pupil, sclera, iris, cornea, lens, ciliary body, retina, choroid, vitreous humor, and optic nerve.
What is the scientific definition of optic nerve?
optic nerve, second cranial nerve, which carries sensory nerve impulses from the more than one million ganglion cells of the retina toward the visual centres in the brain. The optic nerve connects the retina to the visual cortex in the back of the brain.
What is the optic nerve of the eye function?
The optic nerve is a bundle of more than 1 million nerve fibers. Also known as the second cranial nerve or cranial nerve II (CNII), it is the second of several pairs of cranial nerves. It transmits sensory information for vision in the form of electrical impulses from the eye to the brain.
What is an example of optic nerve?
Optic nerves basically link our eyes with the brain. The images which we see are first perceived by the retina as impulses. For example if we are seeing many trees and flowers , our retina first perceives the qualities of these plants like the color, the intensity and creates impulses.
What is optic nerve test?
A bright light will be used to assess the appearance of the optic nerve head, and evaluate the presence of glaucomatous structural damage. It is a quick and painless procedure. The optic nerve is examined at the slit lamp by using special lenses, usually with NO contact with the eye.
Where is your optic nerve?
The optic nerve actually begins at the optic disk, a tiny round protuberance that sits at the back of the eye. The optic disk forms axons, which comprise the optic nerve as it travels from the back of the eye to the underside of the front of your brain.
What part of the brain controls the optic nerve?
occipital lobe
Most visual functions are controlled in the occipital lobe, a small section of the brain near the back of the skull.
What happens if your optic nerve is damaged?
Optic nerve damage is also called optic nerve atrophy or optic neuropathy. The optic nerve is the nerve that connects and transmits information between the eye and the brain. Optic nerve damage can lead to vision distortion, vision loss, and blindness.
Is optic nerve part of the brain?
In sum, the optic nerve is uniquely a part of both the eye and the brain. It is embryologically the brain’s envoy to the eye and functionally the eye’s envoy to the brain.
What can cause optic nerve damage?
What Causes Optic Nerve Damage? Optic nerve damage case be caused by eye diseases like glaucoma, poor blood flow (ischemic optic neuropathy), shock or trauma, toxins such as lead or carbon monoxide, radiation, or diseases of the central nervous system.
How do you know if you have optic nerve damage?
Magnetic resonance imaging (MRI). During an MRI to check for optic neuritis, you might receive an injection of a contrast solution to make the optic nerve and other parts of your brain more visible on the images. An MRI is important to determine whether there are damaged areas (lesions) in your brain.
What does optic nerve mean in medical dictionary?
The optic nerve is a nerve made up of a bundle of Ganglionic cells located in the back of the eye which connects the eye to the brain.
What does the optic nerve for the human eye do?
The optic nerve is located in the back of the eye. It is also called the second cranial nerve or cranial nerve II. It is the second of several pairs of cranial nerves. The job of the optic nerve is to transfer visual information from the retina to the vision centers of the brain via electrical impulses.
What is an optical nerve?
The optic nerve is a bundle of tissue that transmits the signals generated from the eye to the brain. In essence, the optical nerve is the connection between the eye and the brain. It consists of a grouping of over one million nerve fibers, although the tissue of the optic nerve is actually more closely related…
What happens to optic nerve when it reaches the optic chiasm?
The crossing over of optic nerve fibres at the optic chiasm allows the visual cortex to receive the same hemispheric visual field from both eyes. Superimposing and processing these monocular visual signals allow the visual cortex to generate binocular and stereoscopic vision. Nov 17 2019