Not every eye problem requires an urgent visit to a specialist. But some do — and when they do, the difference between acting within hours and waiting a few days can be the difference between keeping your sight and losing it permanently.

The challenge is knowing which symptoms are routine and which are emergencies. Most people have never been taught the warning signs. This article is a clear, practical guide to the eye symptoms that require urgent or emergency attention — and what to do when they occur.

Sudden Loss of Vision Emergency

If you suddenly lose vision in one or both eyes — whether partial or complete — this is an ophthalmic emergency. It may indicate a retinal artery or vein occlusion (a “stroke” of the eye), a retinal detachment, a severe vitreous haemorrhage, or acute optic neuritis. Some of these conditions have a very narrow treatment window. A retinal artery occlusion, for example, causes irreversible damage within hours if blood flow is not restored.

Do not wait to see if it improves. Do not assume it will pass. Contact an ophthalmologist or go to the nearest emergency department immediately.

Sudden Shower of Floaters and Flashes Urgent

Most people experience the occasional floater — a small speck or strand drifting across their vision. These are usually harmless. But a sudden onset of many new floaters, especially accompanied by flashes of light, is a different situation entirely.

This pattern typically indicates a posterior vitreous detachment — a separation of the gel inside the eye from the retina. While often benign, in a significant number of cases it causes a retinal tear. A retinal tear, if not treated promptly with laser or cryotherapy, can progress to a full retinal detachment — a condition that requires emergency surgery and can result in permanent vision loss.

A Curtain or Shadow Across Your Vision Emergency

If you notice what feels like a curtain, veil, or shadow moving across your field of vision from any direction, this is the classic symptom of a retinal detachment. The retina is physically separating from the wall of the eye, and the area of shadow represents the portion of retina that is no longer functioning.

Retinal detachment is a surgical emergency. The sooner the retina is reattached, the better the visual outcome. Delays of even one to two days can mean the difference between recovering good vision and permanent loss.

Severe Eye Pain with Redness and Nausea Emergency

Sudden, severe pain in one eye accompanied by redness, blurred vision, halos around lights, and nausea or vomiting is the hallmark presentation of acute angle-closure glaucoma. In this condition, the drainage angle inside the eye is suddenly blocked, causing intraocular pressure to spike dangerously. Without urgent treatment to lower the pressure, the optic nerve can be permanently damaged within hours.

This is not the same as the slow, silent form of glaucoma most people have heard of. Acute angle-closure is painful, dramatic, and unmistakable. If you experience it, seek emergency care immediately.

Double Vision of Sudden Onset Urgent

Sudden double vision — particularly if it is new, involves both eyes, and does not resolve when you cover one eye — can indicate a serious neurological event. Possible causes include cranial nerve palsies, stroke, aneurysm, or orbital disease. While some causes are benign and self-resolving, others are life-threatening. Sudden double vision always warrants urgent investigation, typically involving both an ophthalmologist and neurological assessment.

Chemical Splash to the Eye Immediate

If any chemical substance enters the eye — household cleaning products, industrial chemicals, battery acid, lime, or cement dust — the most critical first step is immediate irrigation. Hold the eye open under clean running water for at least 15 to 20 minutes. Do this before anything else, including driving to a hospital. Alkali burns in particular can penetrate deep into the eye within minutes and cause devastating, irreversible damage. After thorough irrigation, go directly to an emergency department or ophthalmologist.

Penetrating Eye Injury Emergency

Any injury where an object has pierced, punctured, or embedded in the eye is an emergency. Do not attempt to remove the object. Do not press on the eye or apply drops. Cover the eye gently with a clean shield or cup to prevent further damage, and go immediately to an emergency department. These injuries require surgical assessment and often urgent repair in theatre.

What Is Not an Emergency

For context, the following symptoms are common and usually not urgent, though they still warrant a routine appointment:

• Gradual blurring of vision over weeks or months
• Mild redness without pain or vision loss
• Occasional floaters that have been present for a long time without change
• Mild irritation or dryness
• A stye or small eyelid lump

These should be assessed, but they can generally wait for a scheduled consultation.

What to Do in an Eye Emergency in Durban

If you experience any of the emergency symptoms described above, contact an ophthalmologist directly for same-day assessment. Dr Johann Snyman’s practice in Kloof and Westville maintains capacity for urgent cases and can advise on the appropriate next step when you call. For after-hours emergencies, your nearest hospital emergency department is the first port of call, with ophthalmology follow-up arranged as soon as possible.