Symptom

Blurred vision

Sudden blurring needs urgent care

Medically reviewed by · Last reviewed 2026-07-06 · How review works

When to get urgent help

  • Sudden blurring or loss of vision, especially in one eye
  • Blurring with eye pain, redness or light sensitivity
  • Flashes, a shower of floaters, or a dark shadow over your vision
  • Blurring with weakness, numbness or slurred speech

Common causes

Many things blur vision. These are some of the most common, with the conditions to read about next.

Short-sightedness Distant objects look blurred while near vision stays clear. Long-sightedness Near objects look blurred and the eyes tire with close work. Astigmatism An unevenly curved eye blurs vision at all distances. Presbyopia Age-related loss of near focus from your mid-40s. Cataracts Cloudy, hazy vision that builds slowly, often with glare. Dry eye Blurring that comes and goes and clears when you blink. Macular degeneration Blurred or distorted central vision in older adults. Diabetic retinopathy Fluctuating or blurred vision in people with diabetes. Diabetic macular oedema Central blur or distortion from macular swelling in diabetes.

What can help

  • Book an eye test, as glasses correct many causes of blurring
  • Try lubricating drops if your eyes feel dry and gritty
  • Treat sudden blurring as urgent rather than waiting

Frequently asked questions

Why is my vision suddenly blurry?

Sudden blurring, especially in one eye or with pain, flashes or a shadow, needs urgent assessment. Gradual blurring is more often a focusing problem, cataract or dry eye.

Can blurred vision be fixed with glasses?

Often yes. Focusing problems such as short-sightedness, long-sightedness, astigmatism and presbyopia are corrected with glasses or contact lenses after an eye test.

Is blurred vision a sign of something serious?

It can be. Sudden blurring, blurring with pain or a shadow, or new blurring in someone with diabetes should be checked promptly.

Trusted sources

This page reflects established clinical guidance. For further reading, consult these authoritative eye-health organisations: