---
title: What causes ciliary injection?
description: "Ciliary injection is a ring of deep red or violaceous vessels around the cornea, also called circumcorneal flush. It indicates inflammation of deeper ocular structures. ## Associated Conditions Acute anterior uveitis, keratitis, and acute angle-closure glaucoma classically produce ciliary injection.…"
url: "https://bluefinvision.com/knowledge-base/topics/symptoms-signs/what-causes-ciliary-injection/"
updated: "2025-12-12"
category: "Symptoms & Signs"
---

# What causes ciliary injection?

Ciliary injection is a ring of deep red or violaceous vessels around the cornea, also called circumcorneal flush. It indicates inflammation of deeper ocular structures.

## Associated Conditions

Acute anterior uveitis, keratitis, and acute angle-closure glaucoma classically produce ciliary injection. The redness is most intense at the limbus rather than in the fornices.

- Symptoms often include pain, photophobia, and blurred vision
- Pupil abnormalities and intra‑ocular pressure changes may be present
- Contact lens-related keratitis can show ciliary flush with corneal staining
- Systemic autoimmune or infectious diseases frequently underlie uveitis

## Urgency

Ciliary injection always warrants prompt ophthalmic evaluation. Early diagnosis and treatment help prevent permanent structural damage and vision loss.

- Management may involve steroids, cycloplegics, or pressure-lowering therapy
- Systemic investigations may be needed to find an underlying cause
- Patients should avoid self-medicating with over-the-counter redness drops
- Monitoring ensures timely adjustment of potent treatments