---
title: "Blurred vision | Eye Health Guide"
description: "Common causes of blurred vision, from focusing problems and cataracts to dry eye, and the warning signs that need urgent eye care. Clinically reviewed."
url: https://eyehealthguide.org/symptoms/blurred-vision/
source: Eye Health Guide
licence: "General information only. Cite the URL and the named medical reviewer."
---

Symptom

# Blurred vision

Sudden blurring needs urgent care

Medical reviewer [Mr Mohamed Mohyudin](https://eyehealthguide.org/reviewers/mohamed-mohyudin/)· Last recorded site review July 6, 2026

### About this review

This page inherits the site’s previous review record. A separate, current article sign-off has not yet been recorded.

[How review works](https://eyehealthguide.org/reviewers/) · [Official biography & credentials](https://mohamedmohyudin.co.uk/author/mohamed-mohyudin/)

Quick answer

Blurred vision most often comes from a focusing problem that glasses can correct, or from common conditions such as cataracts or dry eye. However, sudden blurring, especially in one eye or with pain, flashes or a shadow, needs urgent assessment as it can signal a serious problem.

## 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

### On this page ⌄

1. When to get urgent help
2. Common causes
3. What can help
4. Frequently asked questions

## Common causes

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

## 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.

Your next step

## Take this to your appointment

Write down what has changed, when it started, your current medicines and the questions you want answered. Take these to your eye-care appointment.

Sudden loss of sight, severe eye pain or a dark curtain across vision needs immediate assessment. Do not wait to complete a worksheet.

## Trusted sources

For general background, these organisations provide eye-health information. This list is further reading, not a record that they reviewed this article.

- [NHS — Health A to Z](https://www.nhs.uk/conditions/)
- [Moorfields Eye Hospital NHS Foundation Trust](https://www.moorfields.nhs.uk/)
- [American Academy of Ophthalmology — EyeHealth](https://www.aao.org/eye-health)
- [National Eye Institute (NIH)](https://www.nei.nih.gov/)
- [College of Optometrists — Look After Your Eyes](https://lookafteryoureyes.org/)
- [World Health Organization — Eye care, vision impairment and blindness](https://www.who.int/health-topics/blindness-and-vision-loss)