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The eye muscles are essential for vision and control which way the eyes point. There are six eye muscles that work together to create eye movements, allowing the eye to move up, down, side to side, and in circles. These muscles are approximately 100 times stronger than necessary to perform their function, but they can still be weakened by various factors. One common cause of eye muscle weakness is ophthalmoplegia, a condition that affects one or more of the six muscles that control eye movement. Ophthalmoplegia can be internal or external, with internal ophthalmoplegia affecting the three internal muscles that help the eye focus and control pupil size, and external ophthalmoplegia affecting the six muscles that control eye movement. Another cause of eye muscle weakness is ocular myasthenia gravis, which can lead to double vision and drooping eyelids. Additionally, increased screen time due to the pandemic has resulted in strained eye muscles and fatigue, a condition known as Computer Vision Syndrome or Digital Eye Strain. Prolonged focus on activities such as reading, driving, or computer use can also tire out the eye muscles, leading to eye fatigue.
| Characteristics | Values |
|---|---|
| Medical Condition | Ophthalmoplegia, or eye muscle weakness |
| Symptoms | Double vision, watery eyes, light sensitivity, pain between eyes and forehead, burning eyes, eye strain, headaches, drooping eyelids, blurred vision, watery eyes, dizziness, difficulty swallowing, general muscle weakness, etc. |
| Causes | Genetic mutation, congenital disorder, vascular disease, stroke, genetic syndrome, mitochondrial disease, multiple sclerosis, trauma, infarction, diabetes, Graves' disease, Kearns-Sayre syndrome, etc. |
| Treatment | Special glasses, eye patches, treatment of migraines, eye drops, ointments, botulinum toxin injections, eye muscle surgery |
| Prevention | Following the 20-20-20 eye rule, taking regular breaks from screens |
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What You'll Learn
Eye strain from screen time
Excessive screen time can have a negative impact on eye health, causing eye strain, also known as digital eye strain or computer vision syndrome. This is a common issue in today's world, where many of us spend long hours in front of screens. The condition can cause tired, sore or heavy eyes, as well as dryness, blurred vision and headaches.
There are several ways in which screen time can lead to eye strain. Firstly, when we concentrate on a screen, we blink less frequently, which can cause dryness and discomfort. Secondly, the bright light from screens can cause eye fatigue, and the blue light emitted by devices is thought to contribute to digital eye strain. Thirdly, the proximity and viewing angle of devices can cause discomfort and eye strain if held too close to the eyes or at an uncomfortable angle. Finally, the longer one spends in front of a screen without breaks, the higher the risk of developing eye strain, as the eyes are constantly focusing and refocusing.
There are, however, several measures that can be taken to reduce the impact of screen time on the eyes. The 20-20-20 rule is a commonly recommended practice, which involves looking at something 20 feet away for 20 seconds every 20 minutes of screen time. This helps relax the eye muscles and reduce strain. Adjusting screen settings so that the brightness matches the lighting in your environment can also be helpful, as can enlarging text or adjusting the contrast to make reading easier on the eyes. It is also beneficial to remind yourself to blink more frequently when using screens. Ensuring your workspace is well-lit and minimising screen glare by positioning your screen correctly can further reduce eye strain. Taking regular breaks from screens is important, and it is recommended to step away from your device every hour to stretch, walk around and rest your eyes.
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Ophthalmoplegia
There are two types of ophthalmoplegia: chronic progressive external ophthalmoplegia and internal ophthalmoplegia. Chronic progressive external ophthalmoplegia typically appears in adults between the ages of 18 and 40 years. It usually begins with drooping eyelids and difficulty controlling the muscles that coordinate the eyes. Internal ophthalmoplegia refers to paralysis or weakness in one of three internal muscles that help the eye focus and control pupil size. This type of ophthalmoplegia may affect any of the following three internal muscles of the eye: ciliary muscle, dilator pupillae, and sphincter pupillae.
External ophthalmoplegia is usually caused by muscle disorders or mitochondrial diseases such as Graves' disease or Kearns-Sayre syndrome. Ophthalmoplegia is slightly more likely to occur in people with diabetes, particularly men with type 2 diabetes over the age of 45. It can also be caused by neuromuscular disorders such as ataxia neuropathy spectrum or Kearns-Sayre syndrome. Internuclear ophthalmoplegia is often caused by multiple sclerosis, trauma, or infarction. It is also associated with other disorders, and patients may experience additional symptoms such as problems with swallowing and general muscle weakness.
It is important to note that spending a lot of time in front of a computer screen or on phones can cause eye strain and fatigue, leading to weakened eye muscles. However, these activities are not considered risk factors for ophthalmoplegia. By following the 20-20-20 eye rule, you can reduce the strain on your eye muscles. For every 20 minutes spent in front of a screen, try to look away for 20 seconds at something 20 feet away from you.
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Chronic progressive external ophthalmoplegia
CPEO typically appears in adults between the ages of 18 and 40, and its symptoms worsen over time. The condition may affect one eye (unilateral) or both eyes (bilateral). The first sign of CPEO is usually drooping eyelids (ptosis), which can affect one or both eyelids. As ptosis worsens, individuals may compensate by using their forehead muscles to lift their eyelids or lifting their chin to see. Other symptoms include weakness or paralysis of the muscles that move the eye, requiring the individual to turn their head to see in different directions.
CPEO is caused by genetic mutations affecting mitochondrial DNA. Mitochondria are structures within cells that use oxygen to convert energy from food into a form cells can use (a process called oxidative phosphorylation). Mitochondria have their own DNA, called mitochondrial DNA or mtDNA. CPEO is associated with mutations in several genes, including POLG, TWNK, RRM2B, and SLC25A4, which are critical for producing and maintaining mtDNA. These mutations lead to the deletion of large segments of mtDNA in muscle cells. Less commonly, CPEO is caused by mutations in mtDNA itself, specifically in genes like MT-TL1, which provides instructions for making transfer RNAs.
CPEO can be associated with other symptoms, in which case the condition is referred to as progressive external ophthalmoplegia plus (PEO+). These additional symptoms can include hearing loss, loss of sensation in the limbs, impaired muscle coordination, movement abnormalities, cardiac conduction block, or depression.
While there is no cure for CPEO, treatments can address some of the symptoms, and individuals with isolated CPEO generally have a normal life expectancy.
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Internal ophthalmoplegia
Ophthalmoplegia refers to the weakness or paralysis of the eye muscles, which can lead to various vision problems and requires medical treatment. Ophthalmoplegia cases can be split into two main groups: internal and external ophthalmoplegia.
- Ciliary muscle: This ring-shaped muscle affects the shape of the lens, enabling the eye to focus on nearby or faraway objects.
- Dilator pupillae: This muscle enlarges the pupil size to let in more light.
- Sphincter pupillae: This muscle shrinks the pupil size to allow less light to enter.
External Ophthalmoplegia
External ophthalmoplegia, on the other hand, involves weakness or paralysis in one or more of the six muscles that work together to create eye movements. These muscles enable the eye to move up, down, side to side, and in a circular motion. The six extraocular muscles are:
- Superior rectus: This muscle is fixed to the top of the eye and moves it upward.
- Inferior rectus: This muscle is attached to the base of the eye and moves it downward.
- Medial rectus: Fixed to the inside of the eye, this muscle moves it towards the nose.
- Lateral rectus: Attached to the exterior of the eye, this muscle moves it toward the ear.
- Superior oblique: This muscle rotates the eye downward and inward.
- Inferior oblique: This muscle rotates the eye upward and outward.
Causes of Weak Eye Muscles
The increased use of digital devices and bright screens at close distances can cause eye strain and fatigue, leading to weak eye muscles. Conditions such as multiple sclerosis, strokes, infections, autoimmune diseases, and traumatic brain injuries are also associated with ophthalmoplegia.
Treatment and Prevention
While exercises can help strengthen eye muscles and reduce the risk of future eye problems, they cannot treat existing vision problems. In some cases, botulinum toxin injections may be used to relax the muscles around the eyes and relieve symptoms such as double vision.
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Blepharospasm
BEB is a progressive neurological movement disorder, specifically a form of dystonia, in which sustained muscle contractions cause involuntary twitching and repetitive movements. While the exact cause of BEB is unknown, it is believed to be associated with dysfunction within the basal ganglia. It is also believed that genetics may play a role in rare cases, and it sometimes runs in families. Women aged 40 to 60 are more likely to develop BEB, and it is especially common in middle-aged and elderly women.
The symptoms of BEB typically begin as mild and infrequent spasms, which may start as unilateral twitches and progress to forceful and frequent bilateral spasms. As the condition advances, the spasms may intensify, forcing the eyelids to remain closed for extended periods, resulting in substantial visual disturbance or functional blindness. It is important to note that this blindness is caused solely by the uncontrollable closing of the eyelids and not by any dysfunction of the eyes themselves.
While there is no cure for BEB, various treatments can help manage the symptoms. The first-line treatment is botulinum toxin injections, such as Botox, into the eyelid muscles to relax them and stop the twitching. These injections typically need to be administered every 3 to 4 months. If injections are ineffective, surgery, specifically a procedure called myectomy, may be recommended. During a myectomy, a surgeon removes some of the muscle or nerve tissue from the eyelids to alleviate the twitching.
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Frequently asked questions
Ophthalmoplegia, or eye muscle weakness, can lead to various vision problems and requires medical treatment. This condition can affect one or more of the six muscles that keep the eye in place and
Ophthalmoplegia symptoms include double vision, watery eyes, light sensitivity, pain between the eyes and forehead, burning eyes, eye strain, and headaches.
Ophthalmoplegia is generally caused by a disruption of the messages sent from the brain to the eyes. It can be congenital or develop later in life. It can also be caused by other disorders, such as multiple sclerosis, trauma, infarction, or Kearns-Sayre syndrome.
Treatment for ophthalmoplegia depends on the type, symptoms, and underlying cause. Adults can be fitted for special glasses or wear an eye patch to relieve double vision and achieve normal vision.
One simple exercise is the 20-20-20 rule: for every 20 minutes spent in front of a screen, look away for 20 seconds at something 20 feet away. This can help reduce strain on the eye muscles.
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