Ocular Myasthenia Gravis is an autoimmune disorder that affects the nervous system and muscles in the eye, causing weakness of the muscles that control eye movement, ptosis, and double vision.
Weakness of the eye muscles may be an early sign of muscular weakness in general and may lead to muscle weakness in other areas, such as the muscles used for speaking and swallowing, the muscles of the face, the muscles of the arms and legs, and the muscles that control breathing. It may be necessary to see a doctor to find a way to control or manage the symptoms appropriately.
Causes of weak eye muscles
Myasthenia gravis is caused by the body’s immune system attacking itself, causing antibodies to disrupt communication between nerves and muscles, causing the muscles to not function properly, leading to muscle weakness.
The exact cause of immune system malfunction is still unknown, but some factors may increase the risk of immune system malfunction, leading to eye muscle weakness or make existing eye muscle weakness worse, such as:
- Age increases, with women over 40 and men over 60 potentially having an increased risk of developing this condition.
- A history of other immune system disorders, such as rheumatoid arthritis and lupus .
- Thyroid dysfunction or those with thyroid disease
- Use of drugs to treat malaria or arrhythmias
- Undergoing certain surgeries
- Internal infections
In addition, the production of certain types of antibodies in the immune system, the transmission of antibodies from a parent with severe myasthenia gravis to the fetus, or genetic changes that cause congenital myasthenia gravis can also affect the functioning of the immune system.
Eye muscle weakness
Eye muscle weakness often presents with the following symptoms:
- Weak muscles around the eye sockets, resulting in ptosis .
- The two eyes are not the same size or are clearly different.
- Vision problems such as blurred or double vision
- Eye strain or fatigue occurs in the eye area, which may be worse when the eye muscles are used more.
- It may affect facial expressions, such as the eyes looking unnatural when smiling or talking.
- Unable to move the muscles around the eyes normally, such as blinking, opening or closing the eyes.
Symptoms of weak eye muscles that should prompt a visit to a doctor
If the eye muscle weakness progresses to muscle weakness in other parts of the body, especially when there is weakness of the muscles that control breathing (Myasthenic Crisis) and results in difficulty breathing, respiratory failure, it is a life-threatening emergency. Therefore, you should see a doctor immediately.
Diagnosis of ptosis
Initially, the doctor will ask about the patient’s general health history, ask about the symptoms that occur, and perform some additional tests to be able to clearly identify the cause of the eye muscle weakness because the eye muscle weakness may have symptoms similar to other diseases such as myositis.
Examples of additional diagnostic tests include:
- Blood testto look for abnormal antibodies that may be the cause of myositis.
- Neurophysiological tests, such as muscle contraction tests or pupil dilation tests.
- Nerve conduction and muscle response test (Electromyogram)
- An MRIor CT scan to look for abnormalities in the thymus gland, such as tumors, which can be one reason why the immune system malfunctions.
Treatment of weak eye muscles
Currently, there is no cure for myasthenia gravis, but there are ways to help treat, relieve, or control symptoms to an appropriate level, without affecting daily life or affecting it as little as possible.
Examples of treatment for ptosis are as follows:
Self-care
People with weak eye muscles can relieve their symptoms in many ways, such as avoiding excessive eye strain, such as staring at a screen for long periods of time, taking naps or resting their eyes during the day, and applying cold compresses to the eyes, face, and forehead if the weather feels too hot.
In addition, you should eat foods that contain enough protein and carbohydrates to help build energy for the body, strengthen the muscles in the body, and may help relieve muscle weakness.
Drug treatment
Doctors may treat myasthenia gravis with medications that work by reducing the breakdown of neurotransmitters, such as muscle relaxants, to help relieve muscle weakness. In addition, doctors may prescribe steroids or drugs that suppress the body’s immune system, which can have a greater impact on health, but these are only used when other medications have not worked.
Plasma exchange
Doctors may treat myasthenia gravis with plasmapheresis, which removes the abnormal antibodies from the blood and replaces them with normal antibodies from a donated blood. Doctors may also give injections of immunoglobulin to help increase the normal antibodies in the donated blood.
Surgery
Doctors may treat blepharospasm by surgically removing the tumor in the thymus gland if it is found that a malfunction of the thymus gland is affecting the body’s immune system and is causing the blepharospasm.
Complications of ptosis
Eye muscle weakness can lead to many health complications and should be treated appropriately by a doctor, especially severe muscle weakness that affects the respiratory system because it can cause airway obstruction, obstructing breathing, and the patient may need to be put on a ventilator to help with breathing.
Prevention of weak eye muscles
Eye muscle weakness can be difficult to prevent because the exact cause of the condition is unknown. However, there are ways for patients to prevent or reduce the risk of the condition from becoming more severe, as follows:
- Take your regular medication or health problems that may be the cause of your eye muscle weakness strictly as prescribed by your doctor.
- Get enough rest to help reduce eye muscle weakness.
- Eat the five main food groupsin the amount your body needs to ensure that your body receives complete and beneficial nutrients and helps build muscle strength.
- Avoid hot areas as this may worsen your symptoms.
- Manage stress appropriately, as stress can make existing symptoms worse.
Avoid crowded places or wear a mask when in these places to prevent respiratory infections such as colds or the flu , which may worsen existing symptoms.
