Contact lens keratitis risk — what increases concern
Structured for Australian optometry practice.
Clinical decision support only
OptoGuide™ supports professional judgement and does not diagnose or replace clinician responsibility.
Quick answer
- Keratitis risk rises with overnight wear, poor lens hygiene, water exposure, delayed lens replacement, and previous inflammatory events.
- Symptoms matter, but risk history can change triage even before significant slit lamp signs appear.
- Pain, focal staining, infiltrate, photophobia, or central involvement should lower the threshold for referral.
- Escalate early when both risk history and corneal signs point toward infection.
Common causes
- Microbial keratitis associated with wear and hygiene factors.
- Inflammatory infiltrates linked to lens wear.
- Mechanical epithelial compromise increasing infection risk.
- Water-related contamination risk in reusable lens wear.
Red flags (must not miss)
- Overnight wear with new pain or photophobia.
- Swimming or showering in lenses before onset.
- Central corneal staining or infiltrate.
- Reduced vision or anterior chamber reaction.
- Delay in removing lenses despite symptoms.
Use OptoGuide™ to guide this decision during consult.
What to check
- Wear schedule, replacement interval, and cleaning routine.
- Water exposure and storage case hygiene.
- Corneal staining, infiltrate, and lesion location.
- Acuity, pain severity, and photophobia.
- History of previous contact lens complications.
When to refer
- Same day when infection risk and corneal signs are both present.
- Urgent corneal review for central lesions, vision change, or chamber reaction.
- Escalate rather than observe if the diagnosis is uncertain in a high-risk wearer.
Initial management
- Frame contact lens keratitis risk from history and signs together.
- Stop lens wear and record the exposure history clearly.
- Use a low threshold for referral in high-risk contact lens presentations.
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.