Acute Angle Closure & Painful Visual Loss
Recognise acute pressure-related emergencies and avoid delays caused by non-ocular symptoms.
Quick revision ↓ Medical Dictionary
01Recognising an attack
Acute angle closure may cause severe eye pain, blurred vision, haloes, headache, nausea and vomiting. The eye can be red with a cloudy cornea and an abnormal poorly reactive pupil. Not every sign is present. Consider an ocular cause in a patient whose vomiting or headache is accompanied by visual symptoms.
02The mechanism
Obstruction of aqueous drainage can produce a rapid pressure rise. Pupillary block is an important mechanism, but secondary causes and drug-related mechanisms also exist. Angle assessment establishes the anatomical problem. Do not assume that every painful high-pressure eye has the same cause or that the same definitive procedure suits all mechanisms.
03Immediate pathway
Arrange emergency ophthalmic assessment and clinician-directed pressure-lowering treatment under local protocols. Check relevant contraindications and systemic status. Analgesia and antiemetics support care but do not treat the pressure problem. Avoid routine pharmacological dilation when acute angle closure is suspected. Do not wait for symptoms to become more typical before escalating a concerning presentation.
04Definitive management
Specialist treatment addresses both pressure and the underlying obstruction. Laser iridotomy is important for suitable pupillary-block disease, while lens-based or other interventions may be needed in selected cases. The fellow eye also requires evaluation. A temporarily improved pressure does not mean the anatomical risk has disappeared or that follow-up can be cancelled.
05Differentiate other painful eyes
Keratitis, uveitis, scleritis, endophthalmitis and orbital disease can also cause pain and reduced vision. Acuity, pupil findings, corneal appearance, surgery history and movements help direct assessment. If examination is limited or pressure cannot be measured safely, use the clinical concern to obtain urgent help rather than treating missing data as reassuring.
High-Yield Revision
- Eye symptoms with vomiting may represent an ocular emergency.
- Pressure reduction and definitive treatment are separate goals.
- Assess the fellow eye after an angle-closure attack.
Common Pitfalls
- Treating nausea alone and missing the eye problem.
- Dilating a suspected acute angle-closure eye routinely.
References & Further Reading
Read the relevant guideline sections alongside these original clinical teaching cases. Local pathways, available services and individual patient factors determine care.
Reference review: 28 September 2026. Consult current local protocols for prescribing, procedures and escalation.