---
title: "Eye infections and contagious red eye | Eye Health Guide"
description: "Browse eye infections — viral, bacterial and allergic pink eye, corneal ulcers, orbital cellulitis and tropical eye disease — with clear urgency advice."
url: https://eyehealthguide.org/conditions/category/infection/
source: Eye Health Guide
licence: "General information only. Cite the URL and the named medical reviewer."
---

Condition library

# Eye infections and contagious red eye

Infectious and contagious conditions of the eye surface, eyelids and surrounding tissues.

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

Eye infections range from mild viral pink eye to sight-threatening corneal ulcers and orbital cellulitis. Contact lens wearers with a painful red eye need same-day care. Thick discharge, fever, or reduced vision also need prompt assessment.

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## Frequently asked questions

### Is pink eye always bacterial?

No. Most pink eye is viral or allergic. Antibiotics help only when a clinician thinks bacteria are likely.

### When is a red eye an infection emergency?

Severe pain, light sensitivity, reduced vision, a contact-lens-related red eye, or painful swelling with fever need urgent assessment.

### How do I avoid spreading conjunctivitis?

Wash hands often, avoid sharing towels and pillows, and keep children home while eyes are very red and watery if local guidance advises.

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