Blurred Vision

What is it?

Blurred vision is reduced clarity of vision that makes it difficult to see fine details. It is one of the most common eye complaints and has causes ranging from simple refractive errors (needing glasses) to serious ocular and systemic conditions. Sudden blurred vision is a red flag and may indicate a retinal detachment, stroke, or acute glaucoma. Gradual blurring is more often due to cataracts, diabetic retinopathy, macular degeneration, or dry eyes. Any new or worsening blurred vision warrants prompt ophthalmologic evaluation.

Common causes

When to see a doctor

• 1Sudden loss of vision or sudden blurring in one or both eyes — emergency
• 2Blurred vision with eye pain, redness, and halos around lights (acute glaucoma)
• 3Vision changes with headache, confusion, or weakness on one side (stroke)
• 4Floaters, flashes of light, or a curtain descending across vision (retinal detachment)
• 5Gradual worsening over weeks in a diabetic or hypertensive patient
• 6Blurred vision after starting a new medication

What you can do

• ✓Get a comprehensive eye exam — many vision changes are correctable with glasses or contacts
• ✓Control blood sugar and blood pressure closely — both directly affect retinal health
• ✓Follow the 20-20-20 rule for screen use: every 20 minutes, look 20 feet away for 20 seconds
• ✓Use artificial tears if dry eyes are contributing to blurring
• ✓Wear UV-protective sunglasses — UV exposure accelerates cataracts and macular degeneration
• ✓Never ignore sudden vision changes — act the same day

Conditions that cause this symptom

Medications that may help

Treatment depends on the underlying cause. Always consult your provider before starting any medication.

Frequently asked questions