Losing vision suddenly, whether completely or partly, in one or both eyes, needs immediate attention. Some causes can be treated only within a short window of time.
What to do
- Go to the nearest emergency department or eye hospital straight away
- Do not wait to see if it improves
- Do not drive yourself
- Call emergency services if you also have face drooping, arm weakness, slurred speech or confusion
Possible causes
- Retinal artery occlusion, an “eye stroke” causing sudden, painless loss of vision
- Retinal vein occlusion, causing sudden blurring
- Retinal detachment, often preceded by floaters, flashes or a shadow
- Bleeding inside the eye, often in people with diabetes
- Acute angle-closure glaucoma, with a painful red eye, halos, headache and nausea
- Optic nerve inflammation or damage
- Stroke affecting the visual pathways in the brain
Vision that comes back
A temporary “curtain” of vision loss lasting minutes can be a warning sign of stroke. It needs urgent assessment the same day, even if your vision is now normal.
Frequently asked questions
Is sudden blurring in one eye always serious?
It should always be checked urgently. Some causes are minor, but others threaten sight.
Which doctor should I see?
Go to an emergency department or an eye hospital immediately. They will involve other specialists if needed.
Sources
This article is for general information and does not replace an examination by an eye doctor. If you have symptoms, please book a consultation.