What is optic nerve and its 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 the function of the optic in the eye?
An optical disc drive (ODD) in a computer system allows you to use CDs, DVDs, and Blu-ray discs to listen to music or watch a movie. Most drives also allow you to write data to a disc, so you can create your own music CDs, video DVDs or even create of back-up copy of your important data files.
Where are the optic nerves?
The optic nerve is a bundle of more than 1 million nerve fibers that carry visual messages. You have one connecting the back of each eye (your retina) to your brain.
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.
How many optic nerves are in the eye?
Visual Pathways and the Consequences of Damage Nerve signals travel along the optic nerve from each eye. The two optic nerves meet at the optic chiasm. There, the optic nerve from each eye divides, and half of the nerve fibers from each side cross to the other side.
What causes 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.
Can optic nerve cause headaches?
Papilledema is a serious medical condition where the optic nerve at the back of the eye becomes swollen. Symptoms can include visual disturbances, headaches, and nausea.
What is optic nerve pain like?
Most people who develop optic neuritis have eye pain that’s worsened by eye movement. Sometimes the pain feels like a dull ache behind the eye. Vision loss in one eye. Most people have at least some temporary reduction in vision, but the extent of loss varies.
What causes optic nerve problems?
What is the treatment for optic nerve damage?
Optic neuritis usually improves on its own. In some cases, steroid medications are used to reduce inflammation in the optic nerve. Possible side effects from steroid treatment include weight gain, mood changes, facial flushing, stomach upset and insomnia. Steroid treatment is usually given by vein (intravenously).
What is the function of the optic nerve in the eye?
The small photoreceptor cells of the retina (the inner surface at the back of the eye) sense light and transmit impulses to the optic nerve. The optic nerve from each eye carries impulses to the brain, where visual information is interpreted. Damage to an optic nerve or damage to its pathways to the brain results in loss of vision.
What does the optic nerve do for the human eye?
The Anatomy of the Optic Nerve Anatomy. The optic nerve is mainly made up of the axons (nerve fibers) of the retinal ganglion cells from the retina. Function. The optic nerve produces all sorts of visual information. Associated Conditions. Glaucoma refers to a group of diseases that may cause damage to the optic nerve. Treatment.
What is a normal optic nerve?
The normal optic nerve has a healthy appearing “rim” of tissue, which is assessed by both the contour of the rim as well as the color. “Cupping” is the result of changes in the optic nerve related to optic nerve degeneration, where there is a backward bowing of the central part of the disc.
What is the function of optic nerves?
The optic nerve is also responsible for facilitating the focusing of the eye on objects and constricting the pupil in response to light. The third cranial nerve, the oculomotor nerve, is responsible for handling most of the motion of the eye. It also allows the eyelids to raise.