Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
Blurred vision has many causes — from needing glasses or dry eyes to cataract or diabetes. Gradual blurring usually needs an eye test, but sudden blurring or vision loss is an emergency.
Refractive error (needing glasses) — the commonest cause
Dry eye or eye strain
Cataract (gradual clouding, especially with age)
Diabetes affecting the eyes (get sugars and eyes checked)
Migraine can cause temporary visual disturbance
When to see a doctor urgently
Sudden blurred vision or vision loss — emergency
Blurring with weakness, slurred speech or face droop (stroke — emergency)
Blurring with severe eye pain, redness, halos and nausea (acute glaucoma)
A curtain/shadow, or a sudden shower of floaters/flashes
Sudden change = emergency. Gradual blurring usually needs an eye test; sudden blurring or vision loss, or blurring with stroke signs, is an emergency. Diabetics need regular eye checks. MedDroid gives general information, not a diagnosis.
Frequently asked questions
What causes blurred vision?
Most often needing glasses (refractive error), plus dry eye, cataract, diabetes and migraine. An eye test finds the cause of gradual blurring.
When is blurred vision an emergency?
Sudden blurring or vision loss, blurring with stroke signs (weakness, slurred speech), severe eye pain with halos, or a shadow/floaters/flashes — get urgent care.
Can diabetes cause blurred vision?
Yes — high blood sugar and diabetic eye disease both blur vision, so diabetics should get regular eye and sugar checks.
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.