About Benign Essential Blepharospasm

Overview

Benign essential blepharospasm (BEB) is a progressive neurological disorder characterized by abnormal blinking or spasms of the eyelids. It is a type of dystonia, a group of movement disorders involving uncontrolled tensing of the muscles, rhythmic shaking, and other involuntary movements. BEB usually affects both eyes and can range from frequent blinking to persistent severe eyelid closure, sometimes leading to functional blindness. In some cases, it can be accompanied by contractions of other facial muscles or even affect other parts of the body.

Causes and Risk Factors

Benign essential blepharospasm is believed to result from a mix of genetic and environmental factors. While the exact causes remain unknown, certain genetic variations likely increase the risk of developing this condition. Environmental triggers may also play a role in individuals predisposed to the disorder.

Non-modifiable factors for benign essential blepharospasm are factors that cannot be changed or controlled. These include:

• Genetic changes that may predispose individuals to the condition.
• Factors related to specific genes such as GNAL, CIZ1, TOR1A, DRD5, and REEP4.
• Female gender
• Age between 50 and 70

Modifiable factors for benign essential blepharospasm are factors that can be influenced or changed. These include:

• Urban living environment.
• White-collar job associated with high stress levels.
• Prolonged periods of reading or screen time.

Research suggests that mental health conditions like depression, obsessive-compulsive disorder, and anxiety may also be linked to a higher risk of developing benign essential blepharospasm. Additionally, certain eye symptoms like burning, dryness, and grittiness may precede the onset of blepharospasm in some individuals.

Symptoms

Common early symptoms of benign essential blepharospasm include:

• An increased frequency of blinking.
• Dry eyes.
• Eye irritation that can be worsened by factors like wind, air pollution, sunlight, and other irritants.

As the condition progresses or reaches higher severity, individuals may experience difficulty keeping their eyes open due to muscle spasms around the eyes. This can lead to involuntary winking or squinting. In severe cases, the eyelids may remain closed for hours at a time, potentially causing functional blindness without actual damage to the eyes or brain. Additionally, the spasms may spread to affect other facial muscles, leading to symptoms such as jaw clenching, grimacing, and tongue protrusion.

Diagnosis

To diagnose benign essential blepharospasm, doctors may perform the following examinations, tests, and procedures:

• Medical history and physical exam: Your primary doctor will start the diagnostic process by conducting a physical exam and reviewing your medical history.
• Eye examination: An ophthalmologist (eye doctor) can examine your eyes to check for any structural problems and rule out other eye conditions.
• Referral to a neurologist: If no structural issues are found in the eye exam, your doctor may refer you to a neurologist for further testing, which may include:
  • Electromyogram (EMG): A neurologist may perform an electromyogram to measure the muscular activity around the eyes.
  • Nerve velocity test: This test measures how quickly electrical signals travel through your nerves, helping to assess nerve function related to eyelid spasms.

Treatment Options

The goals of treating benign essential blepharospasm are to reduce involuntary eyelid spasms, improve eyelid function, alleviate symptoms that affect vision and enhance the individual's ability to perform daily activities without interference from involuntary eyelid spasms

• Medications:
  • The main medication used for treatment is botulinum toxin injections. These injections work by relaxing the muscles around the eyes, reducing spasms and improving eyelid closure.
  • Other medications like benzodiazepines, anticholinergics, and levodopa may be used with limited success to manage symptoms.
• Therapeutic procedures may include:
  • Protractor myectomy, which involves removing part or all of the eyelid muscles.
  • Deep brain stimulation may be used for severe or refractory cases of benign essential blepharospasm.
• Self-care and health behavior changes include:
  • Reducing stress.
  • Minimizing eyestrain by limiting screen time.
  • Managing light sensitivity with FL-41 tinted lenses.
• Alternative and Complementary Care: Acupuncture can help in some cases.

Treatment plans may differ based on the severity of benign essential blepharospasm and individual factors. Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Side effects can occur. Check with your health care professional or read the information provided with your medication for side effect information.

Progression or Complications

Complications of benign essential blepharospasm include functional blindness due to prolonged eye closure, difficulty with daily activities that require vision, and impacts on overall quality of life. In some instances, the condition can spread beyond the eyes to affect other facial muscles and even muscles in other parts of the body.