Understanding Eye Movement Assessment for Student Nurses
Learn how to recognise abnormal eye movements, compare findings with baseline and connect sudden visual symptoms with the wider neurological picture.
Why assess eye movements?
Eye movement depends on coordinated activity between the brain, cranial nerves and eye muscles. Changes can affect vision and may provide useful information during a neurological assessment.
Do the eyes appear aligned?
Look for a new obvious difference in eye position compared with the patient's normal appearance.
Do both eyes move together?
Eye movements should usually remain coordinated as the patient changes direction of gaze.
What does the patient experience?
Double vision, blurred vision or difficulty focusing may accompany abnormalities of eye movement.
Changes you may notice
Diplopia
The patient may suddenly report seeing two images instead of one.
One eye appears different
A new visible change in the direction of one eye may be clinically significant.
Movement may be restricted
One or both eyes may appear unable to move normally in a particular direction.
Unexpected repetitive motion
Rhythmic or jerking eye movement may be noticed and should be reported if new or clinically significant.
Difficulty fixing on a target
The patient may struggle to maintain visual focus or follow an object smoothly.
Dizziness or imbalance
Abnormal eye movements can occur alongside vertigo, nausea, coordination problems or imbalance.
Observe eye movement systematically
Eye movement assessment should be carried out using the method taught within your clinical area and within your level of competence. Student nurses should focus on recognising new asymmetry, restricted movement and associated symptoms.
Establish baseline
Ask whether the patient normally has a squint, double vision, visual impairment or known eye movement abnormality.
Observe eye position
Look at the resting position of both eyes and identify any obvious new asymmetry.
Observe movement
Using the locally taught method, observe whether both eyes move together through the required directions of gaze.
Ask about symptoms
Check for new double vision, blurred vision, dizziness, headache or other neurological symptoms.
Eye movement changes rarely exist in isolation
Are pupil findings abnormal?
New eye movement abnormality with a pupil change increases concern about neurological deterioration.
Has visual function changed?
Ask about double vision, blurred vision or loss of part of the visual field.
Any dysarthria or aphasia?
New communication changes can form part of a wider neurological presentation.
Any new weakness?
Focal weakness combined with visual or eye movement change should be taken seriously.
Are movements accurate?
Eye movement abnormalities may occur alongside poor limb coordination or ataxia.
Is the patient becoming less alert?
Eye changes with reduced consciousness or a falling neurological baseline require urgent escalation.
New double vision or abnormal eye movement with weakness, speech change, pupil abnormality, severe imbalance or reduced consciousness should be escalated urgently.
When eye movement changes need urgent escalation
- Sudden new double vision.
- New inability of one eye to move normally.
- A sudden new difference in eye alignment.
- Eye movement abnormality with a new pupil change.
- Visual symptoms with new weakness or sensory loss.
- Eye movement change with new dysarthria or aphasia.
- Abnormal eye movements with severe new imbalance or coordination difficulty.
- Eye changes associated with reduced consciousness or head injury.
What is nystagmus?
Nystagmus describes involuntary repetitive movement of the eyes. Some people have long-standing nystagmus, while new eye movement changes may occur during acute illness or neurological disturbance.
Repetitive eye movement
The eyes may appear to move repeatedly rather than remaining fixed steadily on a target.
May accompany dizziness
Patients may report vertigo, nausea or difficulty maintaining visual focus.
Baseline is essential
Establish whether the movement is known and long-standing or is a new clinical finding.
Place eye movement findings within ABCDE
Airway
Confirm airway patency and respond immediately if it is compromised.
Breathing
Assess respiratory rate, oxygen saturation, respiratory pattern and work of breathing.
Circulation
Assess pulse, blood pressure and perfusion within the overall clinical picture.
Disability
Assess consciousness, pupils, vision, eye movements, speech, strength, sensation, coordination and blood glucose according to local practice.
Exposure
Look for injury or other clinical findings that may help explain deterioration while preserving dignity.
Escalate
Report significant new neurological findings promptly and follow the relevant local emergency pathway.
Recognising sudden double vision
Example
A patient tells you they have suddenly started seeing two images when looking across the room.
When you observe their eye movements using the locally taught assessment method, one eye does not appear to move normally in the same direction as the other.
The patient is also newly unsteady when sitting upright.
You recognise the pattern: sudden double vision + abnormal eye movement + new imbalance.
You perform a structured assessment, establish the patient's previous neurological baseline and escalate urgently according to the local emergency pathway.
Describe exactly what changed
Example escalation
βI'm concerned about Mr Patel. He has suddenly developed double vision. His eyes were moving normally earlier, but during assessment one eye now appears unable to follow fully in the same direction as the other. He has also become newly unsteady.β
This communicates the baseline, sudden symptom, observed abnormality and associated neurological change.
Eye movement assessment errors to avoid
- Assuming sudden double vision is simply an eyesight problem.
- Failing to establish whether abnormal eye movement is long-standing.
- Ignoring associated pupil or visual field changes.
- Assessing the eyes without checking the wider neurological picture.
- Trying to diagnose a specific cranial nerve lesion beyond your competence.
- Documenting only βeye movement abnormalβ without describing the finding.
- Ignoring severe dizziness or imbalance alongside abnormal eye movements.
- Waiting for acute neurological symptoms to resolve before escalating.
Observe β compare β connect β escalate
Look at alignment and movement
Notice whether both eyes appear aligned and move together normally.
Check baseline and other findings
Connect eye movement changes with pupils, vision, speech, strength, coordination and consciousness.
Report sudden neurological change
Describe the new symptom, observed abnormality and accompanying neurological signs clearly.
Connect eye findings with the wider neurological assessment
Eye movements become more meaningful when considered alongside pupils, visual fields, strength, sensation, speech, balance, coordination and the patient's normal neurological baseline.
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