---
title: "Optic neuritis | Eye Health Guide"
description: "What optic neuritis is, why it causes sudden blurred vision and pain on eye movement, its link with multiple sclerosis, and why urgent assessment matters."
url: https://eyehealthguide.org/conditions/optic-neuritis/
source: Eye Health Guide
licence: "General information only. Cite the URL and the named medical reviewer."
---

Condition

# Optic neuritis

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

Optic neuritis is inflammation of the optic nerve that usually causes sudden blurred or reduced vision in one eye, often with pain when you move the eye. It most often affects young adults and can be linked to multiple sclerosis. Urgent assessment is important to protect vision and find the cause.

### On this page ⌄

1. Your next step
2. What it is
3. Common symptoms
4. Causes and links
5. Treatment and outlook
6. Related conditions
7. Related symptoms
8. Practical guides
9. Frequently asked questions

## What it is

Optic neuritis is inflammation of the optic nerve, the cable that carries visual signals from the eye to the brain. It usually affects one eye and develops over hours to days, causing the vision in that eye to become blurred, dim or partly lost.

## Common symptoms

Symptoms often come on fairly quickly over a few days.

- Blurred, dim or lost vision in one eye
- Pain behind or around the eye, worse when moving the eye
- Reduced colour vision, with colours looking washed out
- A central blind spot or patchy vision in some cases

## Causes and links

It is often autoimmune, where the body's defences mistakenly attack the optic nerve. It is commonly associated with multiple sclerosis, though it can also follow infection or occur on its own. A first episode needs investigation to understand the cause and risk of recurrence.

## Treatment and outlook

Many people recover useful vision over weeks to months, even without treatment, but urgent assessment is still needed. Treatment may include steroid medicines to speed recovery, and follow-up to check for conditions such as multiple sclerosis. Sudden vision loss in one eye should never be ignored.

## Related conditions

## Related symptoms

## Practical guides

## Frequently asked questions

### Is optic neuritis an emergency?

Sudden blurred or lost vision in one eye, especially with pain on eye movement, needs urgent assessment. While many people recover vision, prompt care helps protect sight and find the cause.

### Is optic neuritis linked to multiple sclerosis?

Often yes. Optic neuritis is a common early sign of multiple sclerosis, though it can also occur without MS. Investigation after a first episode helps clarify the risk.

### Does vision come back after optic neuritis?

Most people recover useful vision over weeks to months, though some colour vision or contrast sensitivity may remain reduced. Early assessment and treatment can support recovery.

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.

## Sources for this information

These references support the information on this page. Follow the linked source for its full context.

- [Hull University Teaching Hospitals - Optic neuritis](https://www.hey.nhs.uk/patient-leaflet/optic-neuritis/)