---
title: Corneal reflex (blink reflex)
description: "The corneal reflex, or blink reflex, is a protective response where both eyes blink when the cornea is lightly touched. It assesses trigeminal and facial nerve function. ## How it is tested Care is taken to minimise discomfort. - A…"
url: "https://bluefinvision.com/knowledge-base/topics/diagnostics-testing/corneal-reflex-blink-reflex/"
updated: "2025-12-17"
category: "Diagnostics & Testing"
---

# Corneal reflex (blink reflex)

The corneal reflex, or blink reflex, is a protective response where both eyes blink when the cornea is lightly touched. It assesses trigeminal and facial nerve function.

## How it is tested

Care is taken to minimise discomfort.

- A fine wisp of cotton or gentle air puff is directed toward the cornea
- Normal response is an immediate blink of both eyelids
- Absence or asymmetry suggests sensory loss in the ophthalmic branch of the trigeminal nerve or motor dysfunction of the facial nerve
- Can also be reduced in contact lens wearers or after refractive surgery

## Clinical relevance

The reflex helps protect the eye and localise neurological lesions.

- Impairment increases risk of exposure keratopathy and corneal ulceration
- Important in assessing coma, brainstem integrity, and facial palsy
- Patients with absent reflex need lubricants and sometimes lid closure procedures
- Findings are interpreted alongside other cranial nerve tests