Have you ever noticed, or experienced, that when you try to look to one side, one of your eyes seems to be looking in the other direction instead of in that direction? Or does one eye stop in the middle and only the other eye moves to the side? This can be a bit of a disturbing and uncomfortable experience. Today we are going to talk about one possible cause of this, which is a condition called `Internuclear Ophthalmoplegia` or `(INO)`. Don't worry, let's explain it simply.
What is INO? (What is INO?)
Simply put, `Internuclear Ophthalmoplegia (INO)` is the medical term for a condition where one of your eyes (sometimes both eyes) doesn't turn completely in that direction when you try to look to the side. For example, if you try to look to the right, your left eye stops in the middle, not going past your nose. Or if you try to look to the left, your right eye does.
If we analyze the meaning of this name a little, "Internuclear" refers to the way the nerve centers (nuclei) work together. "Ophthalmoplegia" refers to the paralysis of the eye muscles. So, in `(INO)`, there is some damage to a special nerve pathway (called the `Medial Longitudinal Fasciculus`) that comes from the brain that coordinates the movements of our eyes. This nerve pathway is like the wiring system of a house. We don't pay much attention to it until it is working properly, but it is only when something goes wrong with it that we realize its value.
INO can affect only one eye (unilateral INO) or both eyes at the same time (bilateral INO).
Important: Sometimes this ``INO'' condition can be a sign of a serious, life-threatening condition, such as a stroke. If you or someone you know experiences these eye changes along with symptoms of a stroke (e.g., drooping of the eyelid, numbness in an arm or leg, difficulty speaking), you should call 911 immediately and go to the hospital.
Some people recover completely from INO. However, some people may have symptoms for the rest of their lives. The length of time it takes to recover depends largely on the underlying cause of INO.
What are the symptoms of INO? (What are the symptoms of INO?)
The main and most obvious symptom is that one eye does not turn properly when looking to the side. In addition, the following may occur:
- Double vision (Diplopia): This is especially noticeable when looking to the side. For some people, it can also happen when looking up. Imagine, what if you were walking down the street and suddenly saw everything in two? It would be very uncomfortable, wouldn't it?
- Blurred or impaired vision: Things that are clearly visible may appear blurry.
- Dizziness: Because the eyes are not working together, balance issues can occur and can feel like dizziness.
- Sometimes, a rapid eye movement (nystagmus) that is unrelated to the direction of vision may be observed.
Why does INO occur? What are the causes?
As I mentioned earlier, IOP is caused by damage to the Medial Longitudinal Fasciculus (MLF), a nerve fiber tract that controls the movement of our eyes. This MLF carries the nerves that control the movement of our head and eyes (including the third cranial nerve, the Oculomotor nerve). It's like a complex "cable system" in our body.
Some people develop INO after a stroke that damages the brainstem. The brainstem is the part of the brain at the bottom that connects our brain to the spinal cord (the system of nerve fibers that runs down the spine). This is a very important part of our central nervous system.
A few main reasons:
Here are some of the main reasons that cause `(INO)`:
- Multiple Sclerosis (MS): This is a disease that affects the nervous system.
- Strokes: Strokes that specifically affect the brainstem.
- Hemorrhage: Bleeding within the brain.
- Arteriovenous Malformation (AVM): A congenital abnormality of the blood vessels in the brain.
- Encephalitis: Inflammation of the brain caused by various infections, such as Lyme disease, HIV infection, and Herpes Zoster (the virus that causes chickenpox and shingles).
- Traumatic Brain Injuries (TBI) are brain injuries caused by severe head injuries .
- Autoimmune diseases: Diseases that attack the body's own cells, such as lupus and Sjögren's syndrome.
How is INO diagnosed?
A doctor will diagnose INO primarily through a physical examination. He or she will look at your eyes and observe how they move. They will ask you to look from side to side, up and down. This will help determine if one eye is moving uncoordinated with the other.
Sometimes, if you have a condition like a stroke or a head injury, this condition can be discovered accidentally during tests done at that time.
What tests are done?
Your doctor may need to do one or more of the following scans to determine if there is damage to the nerve pathway called the Medial Longitudinal Fasciculus (MLF):
- MRI scan (MRI - Magnetic Resonance Imaging) .
- CT scan (CT - Computed Tomography scan)
If these scans don't provide clear information, the doctor may recommend further tests:
- Blood tests: These can detect infections or other problems that may affect the brain.
- Spinal Tap / Lumbar Puncture: This involves taking a sample of the fluid that surrounds your brain and spinal cord (cerebrospinal fluid). This is especially helpful in diagnosing infections.
What are the treatments for INO?
The treatment for (INO) depends on the cause. Your doctor will treat the underlying cause rather than treating the condition itself.
Imagine, if the cause of `(INO)` is a stroke or a disease like multiple sclerosis `(MS)`, it may require long-term treatment – perhaps a lifetime.
If the `(INO)` is caused by an infection, the `(INO)` condition will usually improve once the infection is treated.
Sometimes, if symptoms are persistent, your doctor may give you an injection of botulinum toxin to relax the muscles around your eyes. This can help reduce double vision (diplopia) and involuntary eye twitching (nystagmus).
Your doctor will explain to you what treatment you need and what you can expect from the treatment.
Can INO be prevented?
In fact, it is difficult to completely prevent this condition because the causes (such as emergencies, infections) that cause it occur suddenly and unexpectedly.
But in general, it is very important to wear protective eyewear and proper protective equipment when you are working with tools or engaging in activities that could cause head or eye injuries. This will go some way to preventing traumatic brain injuries, which are one of the causes of INO.
When should eyes be examined?
By regularly checking your eyes and vision, your eye doctor can identify any problems early. The frequency of eye exams generally varies with your age:
- People under 40: Every 5 or 10 years.
- People between the ages of 40 and 54: Every 2 or 4 years.
- People between the ages of 55 and 64: Every 1 to 3 years. (The original article had a typo as 55-54, it should be corrected as 55-64)
- People 65 years and older: Every year or every 2 years.
However, if you have a condition, such as diabetes mellitus, that affects the way your brain controls your eyes, you may need to have your eyes checked more often than this. Ask your eye doctor how often you need to have your eyes checked.
What can someone with INO expect?
INO can sometimes be a temporary problem, but some people may have symptoms throughout their lives. It all depends on what caused the INO to develop in the first place. INO can be long-lasting in conditions like multiple sclerosis (MS) or certain autoimmune diseases.
People who develop `(INO)` due to an infection usually recover after the infection clears up, and there are no long-term effects.
If you have had a stroke, a hemorrhage, or a traumatic brain injury, or if you have multiple sclerosis (MS), you are more likely to have long-term symptoms. How well your eyes and vision recover depends on how long the blood supply to your brain and nerves was cut off.
Talk to your doctor to learn more about what to expect and how to manage your symptoms.
When should I see a doctor?
See a doctor as soon as you notice any changes in your eyes or vision.
Also, if you have any of the following symptoms , go to a hospital emergency room immediately:
- If you can't move your eyes.
- If you suddenly lose your vision (total or partial).
- If you have severe eye pain.
- If you start seeing new flashes or floaters in front of your eyes.
What questions should I ask the doctor?
When you go to see the doctor, don't hesitate to ask questions like these:
- How long will this effect last on my eyes?
- Will my vision change permanently?
- What kind of treatment do I need?
- How often should I have my eyes checked in the future?
What's the difference between INO and Strabismus?
(INO) is caused by damage to the nerve pathway called the Medial Longitudinal Fasciculus (MLF) and the nerves that control eye movement.
Strabismus is a general term for any condition in which the eyes cannot be kept pointing in the same direction. Normally, the six muscles that control our eye movement work together to turn both eyes in the same direction. People with strabismus have difficulty controlling eye movement due to some condition affecting those muscles. So, strabismus is a neurological problem, and strabismus is a broader, often muscular condition.
What is Pseudo-INO? (What is Pseudo-INO?)
`Pseudo-INO` (meaning something like ``false INO``) also shows symptoms similar to ``(INO)``. However, it is a different condition that affects the eyes.
The main cause of `Pseudo-INO` is a disease called Myasthenia Gravis. This `(Myasthenia Gravis)` causes muscle weakness throughout the body. If this weakness affects the muscles around the eyes, you may not be able to control eye movements. If you experience any new muscle weakness, see a doctor.
Take-Home Message
Internuclear ophthalmoplegia (INO) is a condition that affects the ability of your eyes to move smoothly together. It is usually caused by a serious medical condition or an accident. Whatever the cause of your symptoms, your doctor can help you find the right treatment for you. Don't be afraid to ask your doctor any questions you may have during this journey. With prompt medical attention and proper treatment, this condition can be managed.
` internuclear ophthalmoplegia, INO, eye movement, double vision, diplopia, stroke, cranial nerves
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