Optic Neuritis

How is the right optic tract anatomically different from the right optic nerve?


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2008-09-26 11:19:50
2008-09-26 11:19:50

The right optic tract carries information from the left hand side of both eyes visual field, where-as the right optic nerve carries information solely from the right had eye. After the optic nerves from both eyes perform this partial intersection (in the optic chiasm) they then become known as the optic tract. Hope this helps.


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Right optic nerve contains the fibers from the retina of the right eye. The right optic tract contains the fibers from the temporal side of the right eye retina and nasal side of the left eye retina. So when the right optic nerve is affected, you will not see with right eye. When the right optic tract is affected, you will lose the left sided vision. That means you will not see, what is happening on the left side of you.

your optic nerve attatches your eye and brain together

The optic nerve is very sensitive.

When images enter your eye they are upside down and backwards, but your optic nerve turns it right side up and forward.

It is right in the back of the eye above the divergence of the optic nerve.

Yes, right at the point the optic nerve joins the retina.

No it does not. The left optic nerve carries messages to the right side of the brain. The signals cross over to the other side at the base of the brain.

Retina > Optic Nerve (the 2nd Cranial Nerve) > Optic Chiasma (Change over of Left half of retinal image of both eyes to left and right half of retinal image of both eye to right side) > Lateral Geniculate Nucleus in the mid-brain > Optic radiation > Visual cortex

There is a gland in your brain, right behind the optic nerve. That gland controls puberty stages and how your body grows.

It could be the optic nerve. You should see an ophthalmologist right away.

The lesion will be at the opposite of the absent vision of the eye which is the left eye.Marieb&Hoehn page 578A lesion of the right optic nerve causes a total loss of vision in the right eye. the lesion would be of the left optic nerve is the vision were to be reversed

If you have an absence of vision in the right eye's visual field, you may have a headache coming on. This could also be due to a problem with the optic nerve.

Not sure, since I'm working on the same assignment, but I think it is ganglion cells. the gagliano cell axons make a right angle turn at the inner face of the retina then leave the posterior aspect of the eye as the thick optic nerve. page 553 marieb&hoehn axons from the ganglion cells run along the internal surface of the retina and converge posteriorly to form the optic nerve. pg 489 human anatomy 5th ed marieb,mallatt,wilhelm

You can better understand the same from diagram. Visual signals from the retina go via optic nerve. One optic nerve from each eye. In the brain, the fibres from nasal side of retina cross to opposite side of the brain. They crosses at optic chiasm. Fibres from temporal side do not cross and go to the same side of the brain. This tract is called as optic tract. This way the fibres from left side of the retinas go to left side of the brain. Fibres from right side of the retinas goes to right side of the brain.

That answer can be very complicated or very simple. The simple answer is the occipital lobe, or the lobe at the "back" of your brain. A little more complex answer is the visual cortex, which is housed in the cuneus and lingual gyri (divisions) of the occipital lobe, which interpret the image (blend together what the right eye and left eye are seeing individually, as well as keeping the image from being "upside down and backwards"), but not after the different images have passed through the lens, retina, optic nerve, optic chiasm, optic tract, lateral genticulate nuclei, and optic radiations before getting to the cuneous and lingual gyri (in that order), in order to get the images how they need to be (right colors, right blend, right-side-up, right focus, etc). Hope that helps. -A.T. (Resident)

DefinitionOptic nerve atrophy is damage to the optic nerve. The optic nerve carries images of what we see from the eye to the brain.Alternative NamesOptic atrophy; Optic neuropathyCauses, incidence, and risk factorsThere are many unrelated causes of optic atrophy. The most common cause is poor blood flow, called ischemic optic neuropathy, which most often affects elderly people. The optic nerve can also be damaged by shock, various toxic substances, radiation, and trauma.Various eye diseases, most commonly glaucoma, can also cause a form of optic nerve atrophy. In addition, the condition can be caused by diseases of the brain and central nervous system, such as:Brain tumorCranial arteritis (sometimes called temporal arteritis)Multiple sclerosisStrokeThere are also several rare forms of hereditary optic nerve atrophy that affect children and young adults.SymptomsOptic nerve atrophy causes vision to dim and reduces the field of vision. The ability to see fine detail will also be lost. Colors will seem faded. The pupil reaction to light will diminish and may eventually be lost.Signs and testsOptic nerve atrophy can be seen during a complete examination of the eyes. The examination will include tests of:Color lossPupil light reflexTonometryVisual acuityYou may need a complete physical examination and specific tests.TreatmentDamage from optic nerve atrophy cannot be reversed. The underlying disease must be found and treated, if possible, to prevent further loss.Rarely, conditions that lead to optic atrophy may be treatable.Expectations (prognosis)Vision lost to optic nerve atrophy cannot be recovered. If the cause can be found and controlled, further vision loss and blindness may be prevented. It is very important to protect the other eye.ComplicationsComplications are related to the disease that causes the atrophy.Calling your health care providerPatients with optic nerve atrophy will be closely monitored by an ophthalmologist who has experience in neuro-ophthalmology. Tell your doctor right away about any change in vision.PreventionMany causes of optic nerve atrophy cannot be prevented.Ways to protect yourself include:Older adults should have their health care provider carefully manage their blood pressure.Prevent injuries to the face by using standard safety precautions. Most injuries to the face are related to motor vehicle accidents and can be prevented by using seat belts.Schedule a routine annual eye exam to check for glaucoma.Methanol, which is found in home-brewed alcohol, can cause optic nerve atrophy in both eyes. Never drink home-brewed alcohol and forms of alcohol that are not intended for drinking.ReferencesBalcer LJ, Brasad S. Abnormalities of the optic nerve and retina. In: Bradley WG, Daroff RB, Fenichel GM, Jankovic J, eds. Neurology in Clinical Practice. 5th ed. Philadelphia, Pa: Butterworth-Heinemann;2008:chap 15.Arnold AC. Ischemic optic neuropathies. In: Yanoff M, Duker JS, eds. Ophthalmology. 3rd ed. St. Louis, Mo: Mosby Elsevier;2008:chap 9.7.Wax M, Clark A, Civan MM. Mechanisms of glaucoma. In: Yanoff M, Duker JS, eds. Ophthalmology. 3rd ed. St. Louis, Mo: Mosby Elsevier;2008:chap 10.3.Reviewed ByReview Date: 07/28/2010Linda J. Vorvick, MD, Medical Director, MEDEX Northwest Division of Physician Assistant Studies, University of Washington, School of Medicine; and Franklin W. Lusby, MD, Ophthalmologist, Lusby Vision Institute, La Jolla, California. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

blind spot,small portion of the visual field of each eye that corresponds to the position of the optic disk (also known as the optic nerve head) within the retina. There are no photoreceptors (i.e., rods orcones) in the optic disk, and, therefore, there is no image detection in this area. The blind spot of the right eye is located to the right of the centre of vision and vice versa in the left eye. With both eyes open, the blind spots are not perceived because the visual fields of the two eyes overlap. Indeed, even with one eye closed, the blind spot can be difficult to detect subjectively because of the ability of the brain to "fill in" or ignore the missing portion of the image.The optic disk can be seen in the back of the eye with an ophthalmoscope. It is located on the nasal side of the macula lutea, is oval in shape, and is approximately 1.5 mm (0.06 inch) in diameter. It is also the entry point into the eye for major blood vessels that serve the retina. The optic disk represents the beginning of the optic nerve (second cranial nerve) and the point where axons from over one million retinal ganglion cells coalesce. Clinical evaluation of the optic nerve head is critical in the diagnosis and monitoring of glaucoma and other optic neuropathies that may lead to vision loss.

Are at the back of the eye, they connect the eyes to the brain. They also cross to the opposite side so the information collected by the right eye is processed by the left hemisphere and vice versa

At the age of three months, Paterson contracted an ear infection which spread to his optic nerve, leaving him with no sight in his left eye and severely limited vision in his right

The optic nerves send electrical signals from each eye to meet in the brain at the optic chiasma. Here, the left visual signal from one eye is combined with the other eye and the same goes for the right visual signal. Now the signals split again. The right visual heads for the left brain and the left visual makes its way to the right side of the brain. This way, visual messages from both eyes will reach both halves of the visual cortex. The brain then merges the image into one image which you are looking out at the world with. This partial crossing of the nerve fibers at the optic chiasm (or chiasma) is the reason why we humans have stereoscopic sight and a sense of depth perception.what is the function of the optic chiasm?

At the age of three months, Paterson contracted an ear infection which spread to his optic nerve, leaving him with no sight in his left eye and severely limited vision in his right

There is one blind spot in each eye. It is the place where all the light receptor connections in the retina leave the eye and form the optic nerve. There are no light receptors right at this spot which is why it is called the blind spot.

This is an interesting question. Many doctors believe that corticosteroids can positively impact MS and can cause reductions of nerve swelling in a shorter timeframe than without. But recent studies have shown that there is very little effect on optic nerve recovery time when using corticosteroids than without. Optic neuritis, whether caused by MS or not, will right itself within a few weeks to a few months. It should be completely cleared in 6 months for most people. There is little need to help it along.

It's at the base of the brain, right about the center. Just in front of where the spinal cord attaches.

Only half of each optic nerve crosses over. The eyeball is curved so that things in the left part of your visual field are being seen by the right side of each eye ball, i.e, the outer part of the right eye and the inner (nasal) part of the left eye. The images from the left side of the visual field are processed on the right side of the brain so the outer fibers from the right eye stay on the right side and the inner fibers from the left eye cross over to joint them and complete the picture.

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