Sudden vision loss — differential and referral priorities
Structured for Australian optometry practice.
Clinical decision support only
OptoGuide™ supports professional judgement and does not diagnose or replace clinician responsibility.
Quick answer
- Triage sudden vision loss first by onset, laterality, pain, and whether the reduction is monocular or binocular.
- Retinal detachment, vascular occlusion, vitreous haemorrhage, optic neuritis, and acute glaucoma should be separated early.
- Check acuity, pupils, fields, anterior segment findings, and retinal status where possible.
- Same-day escalation is appropriate when vision loss is new, unexplained, or associated with RAPD, field loss, pain, or retinal signs.
Common causes
- Retinal detachment or retinal tear with macular involvement.
- Retinal vascular occlusion.
- Vitreous haemorrhage.
- Optic neuritis or other optic neuropathy.
- Acute angle closure or severe anterior segment disease.
Red flags (must not miss)
- New RAPD, marked acuity drop, or colour desaturation.
- Curtain, field defect, or fundus signs of detachment.
- Cherry-red spot, retinal whitening, or vascular asymmetry.
- Painful vision loss or associated headache, nausea, or photophobia.
- Unexplained sudden loss with limited posterior view.
Use OptoGuide™ to guide this decision during consult.
What to check
- Clarify exact onset, progression, pain, and monocular versus binocular pattern.
- Measure acuity, pupils, colour comparison, and confrontation fields.
- Assess IOP and anterior chamber if angle closure is possible.
- Dilated fundus examination for haemorrhage, detachment, oedema, or pallor.
- Document whether the posterior view is complete or obstructed.
When to refer
- Same day for unexplained sudden monocular vision loss.
- Urgent ophthalmology or emergency review for retinal, vascular, or acute glaucoma suspicion.
- Escalate immediately when the optic nerve or retina appears acutely compromised.
Initial management
- Treat sudden vision loss as time-sensitive until a benign explanation is clear.
- Record acuity, pupils, field findings, and key fundus observations before referral.
- Avoid reassuring a new sudden loss without a complete explanation and exam.
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.