Sudden vision loss means a clear reduction or complete loss of sight in one or both eyes developing over seconds to hours. It is an emergency measured in hours, not days. No benign cause justifies waiting until morning or trying a drop first, because several causes lose their treatment window as time passes. The likely causes differ according to pain and speed of onset. Typically painless causes include retinal artery occlusion, which is effectively a stroke of the eye, retinal vein occlusion, retinal detachment that often begins with flashes and floaters followed by a curtain moving across the field, vitreous haemorrhage which is common in people with diabetes, and ischaemic optic neuropathy. Painful causes include acute angle-closure glaucoma with headache, nausea, and haloes around lights, optic neuritis with pain that worsens on eye movement, severe iritis, and trauma. In people over fifty, giant cell arteritis must be considered when there is headache, scalp tenderness, or jaw pain on chewing, because it threatens the second eye if not treated quickly. One dangerous myth needs correcting: that vision returning by itself after a few minutes means there is nothing to worry about. Transient loss of vision in one eye, like a curtain coming down and then lifting, is a warning of a stroke that may follow within days. It calls for urgent assessment of the arteries and heart, not simply a routine eye appointment. Emergency assessment includes measuring visual acuity, testing the pupil response, measuring intraocular pressure, examining the retina after dilating the pupil, retinal imaging or angiography as indicated, inflammatory blood tests, and neuroimaging when a vascular or inflammatory cause is suspected, with urgent referral when the cause lies in the brain or the body rather than the eye. The limits are stated frankly. The first goals are to stop further loss, protect the other eye, and treat the underlying systemic cause. Vision already lost may recover partly or may not recover at all, and no one can promise you it will return. That is why time is the one factor genuinely in your hands: arriving early widens the options, and delay narrows them.
Procedure steps
- 1
Emergency triage and timing
The exact time and speed of onset are recorded, along with which eye is affected, whether loss is total or limited to part of the field, and whether there was pain, flashes, floaters, or a curtain effect, or whether it was transient and recovered. Stroke symptoms such as weakness or slurred speech are also asked about, since they change the triage pathway immediately.
- 2
Vision, pupil response, and eye pressure
Visual acuity is measured in each eye, the pupil is tested for a relative afferent defect indicating optic nerve or retinal disease, and intraocular pressure is measured, because a very high pressure with pain and nausea means acute angle-closure glaucoma requiring immediate pressure lowering.
- 3
Retinal examination and imaging
The pupil is dilated and the retina, optic nerve, and retinal vessels are examined. Retinal cross-sectional imaging, angiography, or ultrasound is added when haemorrhage blocks the view, in order to identify occlusion, detachment, bleeding, or swelling.
- 4
Urgent blood tests and systemic assessment
When vascular occlusion or arteritis is suspected, urgent inflammatory blood tests are requested and blood pressure, glucose, the heart, and the carotid arteries are assessed. The patient is referred in parallel to neurology or the stroke pathway when the picture is that of a cerebrovascular event.
- 5
Targeted treatment and close follow-up
Treatment follows the diagnosis: lowering eye pressure, urgent surgery for retinal detachment, injections or laser for vascular retinal disease, or specialist-supervised anti-inflammatory treatment. Very close follow-up is then arranged to protect remaining vision and prevent a similar event in the other eye.
Before the procedure
This is not a condition you prepare for with an appointment; go to eye casualty as soon as possible and do not wait for morning. Do not drive yourself, and ask someone to come with you. Do not use any drops or take medication that was not prescribed for you, do not rub the eye, and if there has been an injury do not apply a pressure pad but cover the eye with a rigid shield without pressure. Note on your phone the exact minute the loss began, because this single detail changes treatment decisions. Bring a list of your medications, especially blood thinners, together with previous reports and retinal images if you have them, and your glasses or lenses. Tell the team if you have diabetes, hypertension, heart disease, or an immune condition, and whether you have ever had transient vision loss even for seconds. Mention whether you have eaten recently, since some interventions require anaesthesia.
After the procedure
Keep follow-up appointments precisely, because the first weeks determine much of the outcome, and never stop prescribed treatment on your own even if vision improves. Control blood pressure, blood sugar, and lipids; these are not side issues but the way you protect your other eye, and stop smoking. Avoid heavy lifting, deep bending, and air travel after retinal surgery until your doctor allows it, and sleep in the position you were given if gas was placed inside the eye. Reduce fall hazards at home while your vision is impaired, and do not drive until your visual field has been assessed. Cover the good eye occasionally so you notice any early change in it. **Return to emergency care immediately if vision loss recurs even briefly, if flashes or floaters increase, if a curtain moves across your field, if you develop severe pain with nausea, a new headache with scalp tenderness or jaw pain on chewing, or weakness in a limb or slurred speech.**
Expected duration
Emergency assessment usually takes 30 to 60 minutes, and it must happen within hours of symptom onset rather than days.
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