Recognizing Symptoms and Triggers in EEM

Recognizing the symptoms of epilepsy with eyelid myoclonia (EEM) can be challenging because the signs are often very brief and can look like normal childhood behaviors. However, in EEM, these movements are not habits; they are reflex seizures often triggered by specific actions or environments ^[1][2].

The Hallmark: Eyelid Myoclonia

The most common symptom, giving the syndrome its name, is eyelid myoclonia. This is a specific type of movement that usually lasts less than 6 seconds but can happen dozens or even hundreds of times a day ^[3][4].

When your child has an episode of eyelid myoclonia, you will typically see:

• Rapid Fluttering: The eyelids jerk or blink quickly and repetitively ^[3].
• Upward Eye Rolling: The eyeballs often roll upward, so you may briefly see only the whites of the eyes (upward deviation) ^[5][6].
• Head Movement: In some cases, the child’s head may tilt backward slightly during the fluttering ^[3].

Is it a Tic or EEM?

It is very common for these movements to be mistaken for facial tics. While they look similar, there are key clinical clues:

• Tics are often preceded by an “urge” to move and can sometimes be suppressed for a short time by the child.
• EEM seizures are involuntary and are often tied to specific triggers like light or closing the eyes, though they can also occur spontaneously ^[7].
• Awareness during eyelid myoclonia can vary. Some children remain fully aware, while others may have a “motion arrest” where they stop what they are doing for a few seconds ^[4][5].
• Note: Because tics can also be sensitive to triggers, physical appearance alone cannot make the diagnosis. Proper video-EEG assessment by a neurologist is essential.

Primary Triggers: Eye Closure and Light

What makes EEM unique is that the seizures are frequently “reflexive,” meaning a specific stimulus triggers the brain’s electrical discharge ^[1].

• The Eye-Closure Trigger: This is a defining hallmark of EEM. Closing the eyes—even in a normal room—can trigger an immediate burst of seizure activity on an EEG and visible eyelid fluttering ^[1][8]. This is different from a simple blink; it happens specifically during the transition from eyes open to eyes closed ^[1].
• Photosensitivity (Light Sensitivity): About 76% of children with EEM in study cohorts are sensitive to light ^[9]. Common triggers include:
  • Flickering or strobing lights ^[9].
  • Bright, natural sunlight (especially reflecting off water or through trees) ^[10].
  • High-contrast patterns, such as black-and-white stripes ^[11].

It is helpful to keep a seizure diary to track when these events happen, but avoid intentionally provoking episodes just to test the triggers at home.

Other Seizure Types in EEM

While eyelid fluttering is the main symptom, children with EEM may experience other types of seizures as part of the syndrome ^[9].

• Absence Seizures: In study cohorts, about 56% of children also have absence seizures, which look like brief “staring spells” where the child is unresponsive ^[9]. These often occur at the same time as the eyelid fluttering ^[12].
• Generalized Tonic-Clonic Seizures (GTCS): Roughly 53% of patients in studied groups will experience a “grand mal” or convulsive seizure at some point ^[9]. These involve stiffening of the body and rhythmic jerking. They often appear later in childhood or adolescence and can be triggered by a combination of light sensitivity and sleep deprivation ^[13].

Timing and the “Threshold”

A “seizure threshold” is the level of stability the brain has before a seizure occurs. Certain factors can lower this threshold, making a seizure more likely to happen:

• Awakening: Seizures and eyelid fluttering are often most frequent and intense shortly after a child wakes up in the morning ^[14].
• Sleep Deprivation and Fatigue: Lack of sleep is a well-known trigger that makes the brain more vulnerable to light-induced seizures ^[15][16]. Keeping a consistent sleep schedule is a foundational part of managing the condition.