Understanding Nystagmus for Student Nurses
Learn what nystagmus is, how abnormal eye movements may appear and why new nystagmus should be interpreted alongside balance, coordination, vision and the wider neurological picture.
What is nystagmus?
Nystagmus is an involuntary movement of the eyes. The movement may be horizontal, vertical, rotational or more complex depending on the underlying clinical situation.
The movement is not deliberate
The patient is not consciously producing the repeated eye movement.
The eyes move repeatedly
Nystagmus involves recurring movement rather than one isolated eye movement.
It needs context
Nystagmus should be considered alongside symptoms, neurological findings and the patient's normal baseline.
What might you notice?
During observation or a neurological assessment performed according to local practice, abnormal repetitive eye movements may become apparent.
Side-to-side movement
The eyes may appear to move repeatedly from side to side.
Up-and-down movement
Repetitive vertical eye movement can also occur and requires appropriate clinical interpretation.
A twisting movement may be seen
Some abnormal eye movements may appear rotational rather than purely horizontal or vertical.
What should you establish?
Is it new?
Establish whether the eye movement is a known long-standing finding or represents a new change.
When is it present?
Observe whether the movement is present at rest or appears during particular eye movements according to the assessment being performed.
What symptoms accompany it?
Ask about dizziness, vertigo, double vision, nausea, headache and difficulty with balance or coordination.
What else has changed?
Look for new speech, strength, sensation, coordination or consciousness abnormalities.
Nystagmus rarely tells the whole story
Is the patient experiencing spinning?
Nystagmus may be seen in patients experiencing vertigo, but the underlying cause cannot be determined from this sign alone.
Is the patient unsteady?
New difficulty standing or walking safely can be an important associated clinical finding.
Is movement accurate?
New ataxia or poor coordination alongside abnormal eye movement increases neurological concern.
Any double vision or visual disturbance?
Visual symptoms can provide important additional information about the neurological presentation.
Are there autonomic symptoms?
Nausea and vomiting may occur with severe vertigo and can affect the patient's overall condition.
Is there a new severe headache?
A significant new headache with neurological abnormalities requires prompt clinical assessment.
Connect eye movement with the wider examination
Has speech changed?
New dysarthria or language disturbance adds important neurological information.
Any facial asymmetry?
New facial weakness should be interpreted with the wider pattern.
Any new limb weakness?
Compare both sides and identify significant new focal change.
Any numbness or altered sensation?
Sensory abnormalities may accompany other neurological changes.
Is there new ataxia?
Marked new coordination difficulty can significantly increase concern.
Is alertness changing?
Reduced consciousness with abnormal neurological findings requires urgent assessment.
New nystagmus accompanied by severe imbalance, ataxia, double vision, speech change, weakness or altered consciousness requires prompt clinical assessment.
Do not use nystagmus alone to decide the cause
Abnormal eye movement can occur in different clinical situations. More detailed interpretation requires appropriate training and must be based on the entire presentation.
Balance systems may be involved
Disorders affecting the vestibular system can be associated with vertigo and nystagmus.
Central nervous system causes are possible
Abnormal eye movements may occur as part of a wider neurological presentation.
The wider history matters
Medicines, substances and other clinical factors may affect eye movement and neurological function.
Abnormal eye movement can accompany severe imbalance
Do not assume mobility is safe
Vertigo and visual instability may make standing and walking hazardous.
Protect the patient
Follow local mobility and falls procedures if dizziness or balance is significantly impaired.
Compare with baseline
A sudden inability to sit, stand or walk as usual is clinically important information.
When urgent escalation is required
- New nystagmus with sudden severe loss of balance or coordination.
- New abnormal eye movement with double vision or significant visual change.
- New nystagmus with dysarthria or aphasia.
- Associated facial weakness or unilateral limb weakness.
- Reduced or deteriorating consciousness.
- Sudden severe headache with neurological abnormalities.
- Rapidly worsening neurological symptoms.
- Any significant new neurological presentation causing concern.
Assess the whole patient systematically
Airway
Confirm airway patency and respond immediately to compromise.
Breathing
Assess respiratory rate, oxygen saturation, pattern and work of breathing.
Circulation
Assess pulse, blood pressure and perfusion within the wider clinical picture.
Disability
Assess consciousness and relevant neurological findings including pupils, eye movement, speech, strength, sensation and coordination.
Exposure
Look for additional signs of illness or injury while maintaining dignity and safety.
Escalate
Communicate significant new neurological abnormalities promptly using the appropriate local pathway.
New eye movement with severe imbalance
Example
A patient who was mobilising independently earlier suddenly reports intense spinning dizziness and is unable to remain steady when sitting unsupported.
During neurological assessment, repetitive abnormal eye movements are observed. The patient also reports double vision and their speech sounds newly slurred.
You recognise the pattern: sudden vertigo + abnormal eye movement + severe balance change + double vision + speech change.
You protect the patient from falling, assess them systematically and escalate the acute neurological change urgently according to local procedures.
Report exactly what has changed
Example escalation
“I'm concerned about Mr Davies. He developed sudden severe spinning dizziness about 20 minutes ago. He is now unable to maintain his usual balance and has new repetitive abnormal eye movements. He is also reporting double vision and his speech sounds slurred.”
This communicates the onset, change from baseline, observed eye abnormality, functional deterioration and associated neurological findings.
Nystagmus recognition errors to avoid
- Using nystagmus as a diagnosis rather than a clinical sign.
- Failing to establish whether the eye movement is new or long-standing.
- Ignoring vertigo, balance, coordination or visual symptoms.
- Assuming abnormal eye movement automatically has a benign cause.
- Attempting specialist interpretation outside your competence.
- Ignoring associated speech, strength or sensory changes.
- Asking a severely unsteady patient to walk unsupported.
- Delaying escalation while trying to classify the exact type of nystagmus.
Observe → compare → connect → escalate
Notice the eye movement
Describe what you see and establish whether the finding is new.
Build the neurological picture
Connect eye movement with vertigo, vision, balance, coordination, speech, strength and consciousness.
Act on significant change
Clearly report what is new and escalate significant neurological deterioration promptly.
Connect abnormal eye movement with the wider neurological picture
Nystagmus becomes clinically meaningful when you establish whether it is new and connect it with dizziness, balance, coordination, vision, speech, strength and the patient's overall condition.
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