Contact lens red eye — triage and referral
Structured for Australian optometry practice.
Clinical decision support only
OptoGuide™ supports professional judgement and does not diagnose or replace clinician responsibility.
Quick answer
- A red eye in a contact lens wearer should be treated as potentially corneal until proven otherwise.
- Pain, photophobia, staining defect, infiltrate, or reduced vision increase concern for keratitis.
- History of overnight wear, poor hygiene, or recent water exposure raises risk further.
- Same-day escalation is appropriate when the diagnosis is uncertain or corneal signs are present.
Common causes
- Contact lens-related keratitis.
- Contact lens peripheral ulcer or sterile infiltrate.
- Tight lens or hypoxic red eye.
- Simple conjunctival irritation or giant papillary response.
Red flags (must not miss)
- Moderate pain or marked photophobia.
- Focal staining, infiltrate, or corneal opacity.
- Reduced acuity or central corneal involvement.
- Overnight wear or water exposure with symptoms.
- Unilateral acute presentation that does not look superficial.
Use OptoGuide™ to guide this decision during consult.
What to check
- Lens wear schedule, overnight wear, hygiene, and water exposure.
- Acuity and pain severity.
- Corneal staining pattern and infiltrate location.
- Anterior chamber reaction and discharge pattern.
- Whether the lens has already been removed and for how long.
When to refer
- Same day for suspected microbial keratitis or uncertain corneal involvement.
- Urgent review if central staining, infiltrate, or vision change is present.
- Routine management only when findings are clearly superficial and low risk.
Initial management
- Stop lens wear immediately while assessing the cause.
- Separate microbial risk from inflammatory or mechanical causes early.
- Document corneal signs, lens history, and acuity before escalation.
Clinical basis
This guidance reflects standard optometric clinical reasoning based on:
- Australian optometry clinical practice patterns
- Australian medicines regulation and PBS prescribing context
- Common ophthalmology referral standards
- Evidence-based clinical training and practice
Use OptoGuide™ during consult for structured clinical guidance.