What are the key signs and symptoms that indicate a need for urgent referral to ophthalmology in a patient with suspected acute glaucoma?

Guideline-aligned answer with reasoning, red flags and references. Clinically reviewed by Dr Kola Tytler MBBS CertHE MBA MRCGP.

Posted: 16 August 2025Updated: 16 August 2025 Guideline-Aligned (High Confidence) Clinically Reviewed
Dr Kola Tytler MBBS CertHE MBA MRCGPClinical Lead • iatroX

Key signs and symptoms indicating a need for urgent referral to ophthalmology in suspected acute glaucoma include:

  • Sudden onset of severe eye pain.
  • Marked reduction in vision or visual impairment that cannot be corrected with glasses.
  • Red eye with a cloudy or hazy cornea.
  • Nausea and vomiting associated with eye symptoms.
  • Raised intraocular pressure (IOP), typically significantly above 24 mmHg, measured by Goldmann-type applanation tonometry.
  • Signs of angle-closure on gonioscopy or peripheral anterior chamber depth assessment.

These features suggest an acute angle-closure glaucoma attack, which is an ophthalmic emergency requiring immediate specialist assessment and treatment to prevent permanent sight loss.

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Signs and Symptoms That Indicate a Need for Urgent Referral to Ophthal