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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
Sources & further reading
- World Health Organization (WHO)
- MedlinePlus — U.S. National Library of Medicine
- Ministry of Health & Family Welfare, India
- Indian Council of Medical Research (ICMR)
Reviewed by Dr. Sanjay Anbu, MBBS. 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.