Optic neuritis — red flags and referral
Structured for Australian optometry practice.
Clinical decision support only
OptoGuide™ supports professional judgement and does not diagnose or replace clinician responsibility.
Quick answer
- Optic neuritis usually presents with unilateral vision reduction, colour desaturation, RAPD, and pain on eye movement.
- The disc can appear normal early, so normal fundoscopy does not exclude optic nerve disease.
- Colour vision, pupils, fields, and symptom timing matter more than fundus appearance alone.
- Urgent neuro-ophthalmic or hospital referral is appropriate for suspected optic neuritis or atypical optic neuropathy.
Common causes
- Typical demyelinating optic neuritis.
- Other inflammatory optic neuropathies.
- Compressive or ischaemic optic neuropathy as important alternatives.
- Macular disease mimicking optic nerve-related blur.
Red flags (must not miss)
- Pain on eye movement with unilateral acuity drop.
- RAPD or colour desaturation.
- Central or cecocentral field loss.
- Atypical age, bilateral involvement, or severe disc swelling.
- Neurological symptoms beyond visual loss.
Use OptoGuide™ to guide this decision during consult.
What to check
- Acuity, colour comparison, and contrast where possible.
- Pupils for RAPD.
- Visual field pattern and symptom onset.
- Disc appearance, while recognising early exams can be normal.
- Pain on eye movement and neurological association.
When to refer
- Urgent referral for suspected optic neuritis or unexplained optic neuropathy.
- Same-day escalation when the presentation is atypical or severe.
- Do not delay because the fundus appears normal.
Initial management
- Use optic nerve function tests early rather than relying on fundoscopy alone.
- Document acuity, colour, pupils, and field findings clearly.
- Escalate promptly when optic neuropathy remains in the differential.
Clinical basis
This guidance reflects standard optometric clinical reasoning based on:
- Australian optometry clinical practice patterns
- Australian medicines regulation and PBS prescribing context
- Common ophthalmology referral standards
- Evidence-based clinical training and practice
Use OptoGuide™ during consult for structured clinical guidance.