Paraoptometric professionals are often the first point of contact when patients call with a potential ocular emergency—and they may be present when an emergency occurs in the office. The ability to quickly recognize true emergencies, initiate appropriate first-response actions, and escalate to the doctor is a critical competency tested on both CPO and CPOA exams. Time-sensitive errors in ophthalmic emergencies can result in permanent vision loss.
Ophthalmic Emergencies by Priority Level
Chemical Eye Burn (Alkali or Acid)
Alkali (lime, ammonia, lye, bleach) penetrate deeper and faster than acids. Acids tend to cause surface coagulation that limits penetration.
Level: IMMEDIATE — Irrigate First
Symptoms: Chemical splash/contact with eye; severe burning; redness; discharge; patient may be in extreme distress
Action: IRRIGATE IMMEDIATELY with sterile saline or any available clean water. Hold lids open. Irrigate for minimum 20–30 minutes. Check pH after irrigation (target 7.4). Notify doctor immediately. Do NOT delay irrigation for history taking.
Open Globe / Penetrating Eye Injury
Any full-thickness wound to the sclera or cornea is an open globe. Can result from sharp objects, projectiles, or blunt trauma causing rupture.
Level: IMMEDIATE — Do Not Touch
Symptoms: Visible wound in eye, history of high-velocity injury, extruding ocular contents, severe pain or paradoxically little pain
Action: Do NOT irrigate. Do NOT apply pressure. Do NOT remove any protruding objects. Place a rigid protective shield (eye cup or bottom of paper cup) over the eye—do not tape a soft patch. Call 911 or arrange immediate ER transport. Keep patient calm and still.
Acute Angle-Closure Glaucoma
Blockage of aqueous outflow at the anterior chamber angle causes acute IOP spike (often 40–70+ mmHg), rapidly damaging the optic nerve
Level: EMERGENCY — Same Hour
Symptoms: Sudden severe eye pain, headache, nausea/vomiting, halos around lights, blurred vision, mid-dilated non-reactive pupil, cloudy cornea
Action: Notify doctor immediately. Do NOT dilate the eye. Prepare patient for emergency IOP management. Patient may require urgent laser or surgery.
Retinal Detachment
Separation of neurosensory retina from the RPE, cutting off photoreceptor blood supply. Macula-on detachments preserve central vision if treated urgently.
Level: URGENT — Same Day
Symptoms: Sudden shower of new floaters, photopsias (flashing lights), curtain or shadow in visual field
Action: Notify doctor immediately for same-day evaluation. Arrange urgent referral to retinal specialist. If patient is remote, direct to nearest ER.
Central Retinal Artery Occlusion (CRAO)
Embolic or thrombotic occlusion of the CRA; retinal ischemia begins in minutes; irreversible damage within 90 minutes
Level: EMERGENCY — Minutes Matter
Symptoms: Sudden painless profound vision loss; cherry-red spot at macula on fundus; afferent pupillary defect; pale retina
Action: Alert doctor immediately. Arrange urgent hospital transfer. Patient is at high concurrent risk for cerebral stroke—needs neurological evaluation. Treatment options (ocular massage, IOP lowering, thrombolytics) are time-critical.
Corneal Ulcer / Microbial Keratitis
Bacterial (Pseudomonas, Staphylococcus), fungal, or Acanthamoeba infection of corneal stroma; rapidly progressive
Level: URGENT — Same Day
Symptoms: Severe eye pain, photophobia, discharge, white/gray corneal opacity, decreased vision
Action: Notify doctor. Patient should not wear contact lenses. Same-day evaluation. May need culture and urgent antibiotic treatment.
Hyphema
Trauma-induced bleeding from uveal vessels into the anterior chamber. Risk of secondary hemorrhage, IOP spike, and corneal blood staining.
Level: URGENT — Same Day
Symptoms: Blood in anterior chamber (visible red layering); history of blunt trauma; pain; decreased vision
Action: Notify doctor. Patient should rest with head elevated. Restrict activity. Sickle cell patients at higher risk for complications—flag in history.
Sudden Diplopia with Ptosis or Pupil Involvement
CN III palsy with pupil involvement is the classic sign of posterior communicating artery aneurysm compressing the oculomotor nerve.
Level: EMERGENCY — Rule Out Aneurysm
Symptoms: New binocular diplopia; drooping eyelid (ptosis); dilated non-reactive pupil in same eye; severe headache
Action: This is a neurological emergency. Alert doctor immediately. Patient requires urgent CT angiography or MRI to rule out intracranial aneurysm. Call 911 if doctor is unavailable.
Triage Protocol for Emergency Calls
When triaging an emergency phone call, ask these key questions: