A Five-Step Approach to Acute Vision Loss: A Practical Narrative Review for Clinicians

Background: Acute vision loss is a time-critical presentation that requires rapid evaluation to differentiate benign conditions from ophthalmic and neurologic emergencies. Early recognition and appropriate triage are essential to prevent irreversible visual impairment. In many cases, the initial evaluation is performed by non-ophthalmic clinicians, where diagnostic uncertainty can delay appropriate referral and management. Purpose: To present a practical, stepwise framework for the assessment of acute vision loss that supports rapid clinical localization, early identification of red-flag features, and timely escalation of care. Methods: A targeted review of recent literature was performed using PubMed and MEDLINE, focusing on major causes of acute vision loss, established clinical algorithms, and evidence-based emergency management strategies. Relevant guidelines and high-impact review articles published between 2015 and 2025 were included. Findings: A structured five-step approach—(1) determination of laterality, (2) assessment for pain, (3) targeted history-taking, (4) focused chairside examination with identification of red flags, and (5) action through timely escalation, investigation, and referral, enables clinicians to rapidly triage pathology, prioritise urgency and identify vision-threatening conditions. Presentations such as central retinal artery occlusion, acute angle-closure glaucoma, retinal detachment, optic neuritis, and giant cell arteritis require immediate recognition and specialist involvement. Fundamental chairside assessment remains central to early decision-making and safe triage. Conclusion: A five-step diagnostic framework provides a clear, clinically intuitive approach to acute vision loss that is applicable across emergency, primary care, and general ophthalmic settings. By prioritising early localization and risk stratification, this approach may reduce diagnostic delays and support safer triage of vision-threatening disease. Plain Language Summary: Sudden loss of vision is a medical emergency. Some causes are harmless and temporary, but others can lead to permanent vision loss or serious illness if not recognised and treated quickly. Many people with sudden vision problems first seek help from doctors or healthcare workers who are not eye specialists, which can make early decision-making difficult. This review was written to help clinicians assess sudden vision loss in a clear, practical way. The authors reviewed current medical literature and developed a simple five-step approach that mirrors how clinicians think in real-world settings. The steps focus on whether vision loss affects one or both eyes, whether there is pain, key questions to ask in the medical history, important examination findings, and when to urgently refer for specialist care. The review highlights warning signs that suggest serious conditions such as blocked blood vessels in the eye, inflammation of the optic nerve, retinal detachment, acute glaucoma, and giant cell arteritis, an inflammatory condition that can cause permanent blindness if missed. The framework emphasises the value of careful chairside assessment and early recognition of high-risk features rather than relying on tests alone. This five-step approach is designed to support faster, safer decision-making in emergency departments, general practice, and hospital settings. By helping clinicians identify vision-threatening conditions earlier, this framework has the potential to reduce delays in care and improve outcomes for people presenting with sudden vision loss. Keywords: acute vision loss, emergency ophthalmology, triage