13.1 Diagnostic Fitting Set Decontamination, OSHA & Clinical Infection Control

13.1 Diagnostic Lens Reprocessing & Clinical Infection Control

A multi-patient diagnostic lens contacts the tear film and may contact compromised epithelium. Safe reuse requires a written, validated protocol for the exact lens material, coating, cleaner, disinfectant, storage method, and local regulation. A generic household or patient-care routine is not enough.

Start With Risk and Instructions

The Spaulding framework classifies devices by tissue contact. Items contacting mucous membranes are generally semicritical and ordinarily require at least high-level disinfection when compatible. Contact-lens materials can be damaged by heat and some chemical sterilants, however, and the FDA has noted the absence of a harmonized industry standard covering all in-office trial-lens disinfection and storage.

Therefore, the clinic should reconcile:

• the diagnostic-lens manufacturer’s reprocessing instructions;
• the cleaner and disinfectant labeling;
• material and coating compatibility;
• state-board, facility, and infection-prevention requirements;
• validation for the organisms and contact time of concern.

If the clinic cannot validate safe reuse, use a single-patient lens or do not reuse the lens.

Cleaning Comes First

Remove mucus, lipid, cosmetics, and other soil using a compatible cleaner and mechanical action specified by the manufacturer. Soil can shield organisms and reduce disinfection efficacy. Rinse with the specified sterile or approved solution. Saline removes residue but does not disinfect.

Inspect under magnification. Discard a lens that is chipped, crazed, cracked, warped, deeply scratched, or otherwise impossible to clean reliably. Record the lens identifier so the correct parameters return to the correct set.

Do Not Misclassify Care Products

A one-step hydrogen-peroxide contact-lens system disinfects compatible patient lenses when used with its dedicated case for the full labeled cycle. That labeling does not automatically make the product a high-level disinfectant for multi-patient medical-device reprocessing.

Menicon Progent combines hypochlorite and bromide and is used for intensive cleaning and protein removal on compatible GP lenses. Menicon specifies a 30-minute treatment and then directs cleaning and disinfection with Unique pH or another preferred labeled solution. Progent is incompatible with Hydra-PEG. Do not claim that it alone is an FDA-cleared high-level disinfectant that eradicates every Acanthamoeba cyst, virus, fungus, and biofilm.

Autoclaving may deform common GP materials, but the governing rule is again the lens manufacturer’s validated instruction. “Never autoclave any rigid lens” is broader than the evidence and should not replace material-specific guidance.

Storage Is Protocol-Specific

Drying reduces microbial growth in many storage systems, but neither CDC nor the American Academy of Optometry universally mandates dry storage for every diagnostic GP or scleral set. Storage must follow the validated protocol and lens/coating instructions. For example, Hydra-PEG manufacturer guidance calls for storage in a compatible solution and warns that dry storage can damage the coating.

Whether storage is dry or wet, use a clean labeled container, prevent tap-water exposure, replace contaminated or damaged cases, control solution dates, and reprocess the lens again if storage integrity is uncertain.

Ophthalmic Equipment and EKC

Noncritical slit-lamp surfaces such as chinrests, forehead rests, handles, and controls should be cleaned and disinfected between patients with a compatible EPA-registered product and its required wet-contact time.

Goldmann tonometer tips contact the ocular surface and require the instrument manufacturer’s validated process. During epidemic keratoconjunctivitis control, CDC recommends cleaning and then disinfecting tonometer tips for 5 to 10 minutes with 5,000 ppm chlorine or 70% ethyl alcohol when compatible and manufacturer-approved, followed by thorough rinsing in water and air drying. CDC specifically notes that 70% isopropyl alcohol is not effective against adenovirus and should not be relied on for EKC control.

For room surfaces during EKC, use an EPA-registered disinfectant effective against adenovirus and observe the full contact time. Cohort suspected patients and avoid moving contaminated equipment between rooms.

Hand Hygiene and PPE

Wash with soap and water for at least 20 seconds when hands are visibly soiled or after relevant exposure. Otherwise use an appropriate alcohol-based hand rub consistent with facility policy, then allow hands to dry before lens handling. Avoid touching a lens with wet hands and never rinse it with tap water. Use gloves and other personal protective equipment when exposure to blood, secretions, nonintact skin, or hazardous chemicals is anticipated.

OSHA’s Bloodborne Pathogens Standard applies to occupational exposure to blood and other potentially infectious materials. Maintain an exposure-control plan, training, sharps safety, post-exposure procedures, and appropriate PPE. It does not turn every tear-film contact into a bloodborne-pathogen event.

A Defensible Reprocessing Workflow

1. Segregate the used lens from clean stock and record its identifier.
2. Perform hand hygiene and use indicated PPE.
3. Clean and rinse using material-compatible products.
4. Inspect for damage and discard if integrity is compromised.
5. Apply the validated disinfectant at the correct concentration and full contact time.
6. Rinse, neutralize, dry, and store exactly as the protocol requires.
7. Reverify lens identity and parameters before the next use.
8. Document date, operator, products, lot or expiry when required, contact time, and any deviation.

Exam Traps

• Progent is not a substitute for its labeled post-treatment disinfection step.
• Consumer saline does not disinfect.
• “Dry storage always” and “wet storage always” are both unsafe shortcuts.
• Isopropyl alcohol is not reliable against adenovirus in EKC control.
• A disinfectant is effective only at its validated concentration, contact time, and compatible use.
• When reprocessing cannot be validated, do not reuse the diagnostic lens.