Sudden painless visual loss
- Clinical approach
Vision lost in minutes or hours without pain is an emergency: the retina, optic nerve or brain is short of blood, or the retina has detached.
See it in 3D: Retina · Central retinal artery · Optic disc · Optic nerve · Visual cortex
What it is
Sudden painless loss of vision in one eye usually comes from an artery or vein occlusion of the retina, a retinal detachment, a vitreous haemorrhage or an ischaemic optic neuropathy. Loss in both eyes, or of half the field, points to the visual pathway behind the eye, often a stroke. In anyone over 50, giant cell arteritis must be considered at the first visit because the other eye can be lost within days.
Red flags
- Age over 50 with headache, jaw pain on chewing, scalp tenderness, fever or shoulder and hip stiffness: giant cell arteritis.
- Onset within the last hours: central retinal artery occlusion can be a treatable stroke.
- A curtain or shadow spreading across the vision after floaters and flashes: retinal detachment.
- A relative afferent pupillary defect: extensive retinal or optic nerve damage.
- Loss of the same half of the field in both eyes, or other neurological signs: stroke.
Step-by-step approach
- Confirm whether one eye or both are affected by covering each eye: a homonymous field loss is often reported as loss in one eye.
- Record the time of onset, whether it was transient or persistent, and the vascular risk factors.
- Measure visual acuity and check for a relative afferent pupillary defect.
- Look at the red reflex: an absent reflex suggests vitreous haemorrhage.
- Examine the fundus: pale retina with a cherry-red spot, scattered haemorrhages, a detached retina or a swollen disc.
- Test the fields by confrontation and do a brief neurological exam.
- In patients over 50, ask the symptoms of giant cell arteritis and order ESR and CRP at the same visit.
Main causes of sudden painless visual loss
| Cause | Clue | Fundus | Urgency |
|---|---|---|---|
| Central retinal artery occlusion | Abrupt, profound; vascular risk factors | Pale retina, cherry-red spot | Emergency (stroke pathway) |
| Central retinal vein occlusion | Blurred or reduced vision on waking; hypertension, glaucoma | Haemorrhages in all quadrants, swollen veins and disc | Same day |
| Retinal detachment | Floaters, flashes, then a curtain | Grey elevated retina | Same day; emergency if the macula is still attached |
| Vitreous haemorrhage | Shower of dark floaters; diabetes | Poor view, dull red reflex | Same day |
| Arteritic ischaemic optic neuropathy | Over 50, headache, jaw claudication | Pale swollen disc | Emergency (steroids now) |
| Occipital stroke | Same half of the field lost in both eyes | Normal | Emergency (stroke code) |
| Neovascular macular degeneration | Central blur and distortion, over 50 | Haemorrhage or fluid at the macula | Urgent (days) |
Keys to the differential
- Painless sudden visual loss with a cherry-red spot is an eye stroke: it carries the same risk of brain stroke as a transient ischaemic attack.
- Normal eyes and pupils with a homonymous field defect place the lesion behind the chiasm.
- A dull red reflex in a person with diabetes suggests vitreous haemorrhage from proliferative retinopathy.
- Altitudinal loss (the upper or lower half) with a swollen disc is ischaemic optic neuropathy; with a raised ESR it is arteritic until proven otherwise.
Next step / Initial management
- Every case of sudden visual loss: same-day assessment by ophthalmology; within hours if onset was recent.
- Central retinal artery occlusion or homonymous loss within hours: send to the emergency stroke pathway (brain and vessel imaging, ECG, stroke unit).
- Suspected giant cell arteritis: ESR and CRP, start high-dose corticosteroids the same day without waiting for the biopsy, refer to ophthalmology and rheumatology.
- Retinal detachment with the macula still attached: emergency surgery; advise rest and no strenuous activity while transfer is arranged.
- Central retinal vein occlusion: control blood pressure, check glucose, lipids and eye pressure; ophthalmology follow-up for macular oedema and new vessels.
Test yourself
Think of the answer, then tap the question to see it.
Which tests should be ordered at the first visit for sudden visual loss in a 75-year-old with headache?
ESR and CRP for giant cell arteritis, with corticosteroids started the same day if it is suspected, without waiting for the biopsy.
What does a cherry-red spot at the macula with a pale retina indicate?
A central retinal artery occlusion: an eye stroke that needs urgent stroke evaluation.
How is a homonymous field defect told apart from a problem in one eye?
By covering each eye in turn: the same half of the field is missing in both eyes, and the eyes and pupils are normal.
Elsewhere in DurgiPedia
- Fundoscopy: the optic disc, papilledema and retinopathy
- Pupils: light reflex and abnormal pupils (Marcus Gunn, Horner, Argyll Robertson)
Connections
See it in 3D5
The structures of Durgical's 3D anatomy where it is found.
Educational content; not a clinical guideline and no substitute for assessment by a health professional. For sudden visual loss, severe eye pain, a chemical burn or an eye injury, go to an emergency department at once.
Sources: Central Retinal Artery Occlusion (StatPearls Publishing (NCBI Bookshelf), 2024); Central Retinal Vein Occlusion (StatPearls Publishing (NCBI Bookshelf), 2023); Giant Cell Arteritis (Temporal Arteritis) (StatPearls Publishing (NCBI Bookshelf), 2024); Retinal Detachment (StatPearls Publishing (NCBI Bookshelf), 2024).
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Representative model, for educational purposes only.