Surfactant Cleaners, Protein Removers & Weekly Cleaning

Surfactant Cleaners, Protein Removers & Weekly Cleaning

Quick Answer: Surfactant daily cleaners remove lipid, mucus, and debris by rubbing the lens 20–30 seconds on each side and rinsing with saline. Enzymatic protein removers (subtilisin, papain) are weekly tablets dissolved in saline, used primarily for conventional and quarterly replacement soft lenses. Daily disposable lenses need no cleaners at all. After the 2006 Fusarium outbreak, the FDA recommends rub-and-rinse for all lenses, even those labeled "no-rub."

Surfactant Daily Cleaners

Surfactant cleaners lower the surface tension of the tear film contaminants on the lens, allowing lipid, mucus, and environmental debris to be lifted off the surface and rinsed away. They are applied by placing a few drops on the lens and rubbing with a clean finger.

Rub Technique

1. Wash and dry hands thoroughly
2. Place lens in palm of hand
3. Apply 2–3 drops of daily cleaner
4. Rub lens 20–30 seconds on each side using a back-and-forth motion (not circular, which can tear soft lenses)
5. Rinse thoroughly with sterile saline
6. Soak overnight in disinfecting solution

Surfactant cleaners do not disinfect—they clean only. A separate disinfection step is mandatory. Modern MPS formulations combine cleaning and disinfection in one bottle, but the rub step remains the gold standard for mechanical cleaning.

Protein Removers (Enzymatic Cleaners)

Tear film proteins (lysozyme, lactoferrin, albumin) deposit on contact lens surfaces over time. Soft hydrogel lenses, particularly ionic high-water materials, attract protein heavily. Enzymatic cleaners break down protein deposits that surfactant cleaning cannot remove.

Active Agents

• Subtilisin — bacterial protease, the most common enzymatic cleaner in tablet form
• Papain — plant-derived protease (papaya), used in some older formulations

Weekly Regimen

For conventional (annual) and quarterly replacement soft lenses:

1. After routine cleaning and disinfection, drop one enzymatic tablet into the lens case with each lens
2. Soak for the period specified by the manufacturer (typically 15 minutes to 2 hours, or overnight depending on formulation)
3. Rinse thoroughly with saline
4. Disinfect again before insertion (peroxide-based enzymatic cleaners may require a fresh disinfection cycle)

Enzymatic cleaning is typically not needed for:

• Daily disposable lenses (discard daily)
• Two-week and monthly silicone hydrogel lenses (deposits are removed at disposal)
• Most frequent-replacement regimens unless heavy depositors

For RGP lenses, protein deposits are less common but still occur; RGP-specific enzymatic tablets are available.

Daily Disposable Lenses: No Cleaners Needed

Daily disposable lenses represent the lowest infection risk of any soft lens modality because they eliminate the care system entirely. The patient discards the lens at the end of the day and inserts a fresh sterile lens the next morning. There is no need for:

• Daily cleaner
• MPS
• Hydrogen peroxide
• Enzymatic tablets
• Lens cases

For patients with recurrent solution sensitivity, heavy depositors, or compliance concerns, switching to daily disposable lenses is often the **most clinically effective solution—eliminating the care system eliminates care-system complications.

Rub & Rinse: Why It Still Matters

In the early 2000s, several MPS products were marketed as "no-rub" solutions, promising disinfection without a mechanical cleaning step. After the 2006 Fusarium outbreak linked to ReNu with MoistureLoc (Bausch & Lomb), the FDA, CDC, and American Optometric Association revised their guidance:

• The FDA now recommends rub-and-rinse for all contact lenses regardless of no-rub labeling
• The mechanical rubbing step removes biofilm and deposits that no-rub soaking alone cannot
• "No-rub" labels were removed from most U.S. MPS products after 2006

Patients who skip the rub step are at higher risk of:

• Microbial keratitis (bacterial and fungal)
• Heavy deposit buildup
• Reduced lens surface wettability
• Shorter comfortable wearing time

Deposit Formation and Removal

Three main deposit types form on CL surfaces:

Signs of deposit buildup at follow-up:

• Reduced visual acuity with the lens on
• Increased awareness, dryness, discomfort
• Visible film or spots on slit-lamp inspection
• fluorescein staining in deposit distribution patterns
• Infiltrates or immune reactions to deposits

Weekly Cleaning Schedule

For conventional and quarterly soft lens wearers, the recommended weekly schedule is:

1. Daily: surfactant clean (rub 20–30 sec) → rinse → disinfect overnight
2. Weekly: enzymatic cleaner tablet added to overnight soak → rinse → disinfect before insertion

For frequent replacement (2-week, monthly) patients, enzymatic cleaning is rarely required if the daily rub-and-rinse is performed consistently. The lens is replaced before deposits accumulate to a clinically significant level.

For daily disposable wearers, no cleaning is required—dispose and replace.

Special Considerations for RGP Lenses

RGP lenses accumulate deposits differently than soft lenses. Because RGP materials are rigid and non-hydrophilic (with the exception of surface wetting treatments), protein binds less aggressively but lipid and inorganic deposits still form. Weekly enzymatic cleaning is generally not required for RGP lenses unless the patient is a heavy depositor. The daily regimen for RGP emphasizes:

• Surfactant cleaning with an RGP-specific daily cleaner (rub 20–30 seconds)
• Rinsing with saline or RGP rinsing solution
• Wetting before insertion with RGP wetting solution to improve surface wettability and cushioning
• Soaking in RGP soaking solution overnight to maintain parameter stability

RGP lenses should never be cleaned with soft-lens daily cleaner or allowed to dry out, because surface crazing and parameter shift can occur.

Counseling Points for Compliance

Patient non-compliance with cleaning regimens is the leading driver of deposit-related complications. Key counseling messages at dispensing include:

• Rub-and-rinse is not optional, even when the bottle says "no-rub"
• Replace the lens case every 3 months at minimum; sooner if it appears cloudy or cracked
• Never top off solution — discard and refill the case completely each day
• Use only the recommended solution — switching solutions without consulting the fitter can cause SICS, sensitivity, or parameter changes
• Daily disposable wearers should never reuse a lens — reinsertion defeats the infection-prevention benefit of the modality