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My Child Has:
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Optic Neuritis
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Optic neuritis (ON) involves an attack of inflammation (swelling) in your optic nerve. Your optic nerve sends information from your eye to your brain about what you are seeing. In ON, there is damage to myelin, the protective covering of your nerve fibers. Myelin is also called white matter due to its color. Because ON affects myelin, it is a type of "demyelinating" disorder.
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The symptoms of ON can affect one or both eyes. They include:
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- blurred vision,
- loss of color vision,
- complete loss of vision,
- eye pain.
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- ON is an "autoimmune" condition that often follows an infection such as a cold. Your immune system protects your body from things like bacteria and viruses. Autoimmune diseases confuse your body's immune system. Instead of fighting against bacteria or viruses, it attacks your healthy cells and tissue. In ON, your immune system reacts against your optic nerve. Autoimmunity is not contagious, but may be genetic (inherited from parents).
- ON may also follow a vaccination, although this is rare.
- In some cases of ON, a specific trigger/cause cannot be identified.
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There is not one specific test that is used to diagnose ON. There are several exams and tests that your doctors may look at including:
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- Your child's medical history,
- A neurological examination,
- Brain MRI scan to look for swelling in the optic nerve,
- A lumbar puncture (spinal tap) to make sure that there is not an infection in the spinal fluid, such as meningitis or encephalitis, and to measure the pressure in the spinal fluid.
- Blood tests to look for infectious triggers and for other conditions which can be confused with ON.
- Special eye tests of side vision (called visual fields) and the electrical function of the optic nerve (called visual evoked potentials) may be done by an eye doctor (ophthalmologist).
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In order to perform the testing and undergo treatment (see below), children with ON are usually hospitalized for 1 week.
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Medications are used to reduce the inflammation (swelling) in the optic nerve in ON. The main medication that is used is called methylprednisolone (Solu-medrolŪ), which is a corticosteroid given by IV once a day for three to five days. This medication is completely different from the illegal steroids that some athletes use. Most children with ON improve with high doses of methylprednisolone.
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Most children tolerate the steroids (the medication) very well. Some children can develop temporary moodiness or other behavioral changes. Steroids can also cause increases in blood pressure and blood sugar, which your doctors and nurses will check for and treat if necessary. Steroids can also irritate the stomach lining. A medication such as ranitidine (ZantacŪ) will be given to prevent this stomach irritation.
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Some children will be placed on a steroid medication called prednisone for a short period of time. While on the prednisone, a medication to prevent stomach irritation may also be prescribed.
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Steroid treatment can reduce some visual symptoms and stop new symptoms from developing. Although the long term prognosis for children with ON varies, most children make a complete or nearly complete recovery, including those children with initially severe symptoms. For most children, recovery begins within days and continues for up to one year. Some patients can have residual symptoms such as blurred vision or decreased color vision.
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Most children return to their baseline school performance. However, some children may have new difficulty with their school work. This may be due to several factors, including missed school days during the illness, as well as changes in vision. If you notice changes in your child's school performance, it is important to let your medical providers know so that they can work with the school to develop an educational plan.
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No. In most patients, ON occurs only once. In some patients, it can re-occur. When it re-occurs, the symptoms can be identical to the initial episode, but can also be different. It is not known why patients develop ON with certain infections at certain times. If you notice symptoms during an infection that you think are unusual, such as confusion, changes in vision, weakness, numbness, or imbalance, it is important to notify your doctor immediately.
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Both ON and MS involve autoimmune responses to myelin - they are both "demyelinating" disorders. Symptoms common to both disorders include loss of vision. Corticosteroids are used to treat attacks of ON and MS.
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Although children can develop MS, it is much more common in adults. Common symptoms of MS such as weakness, numbness or loss of balance do not occur in ON. There are also clues on brain MRI to distinguish ON from MS. Most importantly, ON typically occurs only once, while patients with MS have further, repeated attacks of inflammation in the brain and spinal cord. Most patients with MS are treated with ongoing medication to prevent such attacks. Patients with ON do not require such medication.
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Although most children do not, some children who initially have ON can later develop MS if they have new attacks affecting other parts of the brain or spinal cord. Therefore, it is important to have ongoing follow up with your doctor. If you notice new symptoms, such as visual loss, weakness, numbness or loss of balance, it is important to let your doctor know immediately.
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After discharge from the hospital, it is important to follow up with your neurologist and ophthalmologist in the outpatient clinic. He/She will perform a neurological and eye examination on your child. A follow-up brain and/or spinal cord MRI and visual field testing may also be done.
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