Blurred vision: causes, warning signs & what to do
Blurred vision is often just a need for glasses or dry eyes, but sudden blurring or loss of vision is an emergency for the eye.
Common causes of blurred vision
- Refractive error (needing glasses)
- Dry eyes
- Cataract (gradual clouding)
- Diabetes affecting the retina
- Migraine (temporary aura)
- Glaucoma; retinal problems
When to see a doctor urgently
- Sudden loss of vision, or a "curtain" over your sight — call your local emergency number now
- Blurred vision with severe eye pain, redness and nausea
- Blur with weakness, slurred speech or a severe headache (stroke)
- Flashes and a shower of new floaters (possible retinal detachment)
Frequently asked questions
When is blurred vision an emergency?
Sudden vision loss, a curtain across your sight, severe eye pain with redness, or blur with stroke symptoms all need immediate care.
Can diabetes cause blurred vision?
Yes — high blood sugar can blur vision temporarily and, over time, damage the retina. Diabetics should have regular eye checks.
Explore more
MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.