Protein buildup on contact lenses comes from your own tears, and the most effective way to remove it combines a physical rub step with the right cleaning solution for your lens type. Hydrogen peroxide systems generally outperform multipurpose solutions for protein removal, and enzymatic cleaners can tackle heavier deposits. But the approach that works best depends on what your lenses are made of, how long you wear them between replacements, and whether you are actually rubbing your lenses during cleaning or skipping that step.
Where the Protein Comes From
Every time you blink, your tear film washes over your contact lenses. That tear film carries proteins, lipids, and mucins, all of which gradually stick to the lens surface and absorb into the lens material itself. The protein that researchers have studied most is lysozyme, a small, positively charged molecule that is abundant in tears. Albumin, a much larger protein with a negative charge, deposits differently and tends to sit on lens surfaces rather than soak deep into the material.1Contact Lens and Anterior Eye. Albumin adsorption to contact lens materials: a review These deposits start forming within hours of putting your lenses in, and they accumulate over days and weeks of wear.
Protein buildup is not just a cosmetic issue. Deposited proteins can reduce the clarity of the lens, make lenses feel dry and uncomfortable, and trigger inflammatory reactions on the eye’s surface. Some deposited protein retains its biological activity, which is actually a good thing for fighting bacteria on the lens surface. But denatured protein, meaning protein that has lost its natural shape and function, can irritate the eye and contribute to conditions like giant papillary conjunctivitis, an allergic-type reaction of the inner eyelid.
Why Your Lens Material Matters
Not all contact lenses attract protein equally. The biggest factor is the lens material’s chemistry. Traditional hydrogel lenses that are ionic and have high water content consistently absorb the most protein, pulling it deep into the bulk of the material. Silicone hydrogel lenses, by contrast, tend to pick up less total protein but are more prone to nonpolar lipid deposits like oils from your tears and skin.2PubMed. A review of the last 10 years regarding protein and lipid deposition on soft contact lenses
The numbers are dramatic. In one study, after 14 days of soaking in an artificial tear solution, an ionic hydrogel lens (etafilcon A) accumulated roughly 2,200 micrograms of lysozyme. A silicone hydrogel lens (balafilcon A) accumulated about 50 micrograms, and another silicone hydrogel (lotrafilcon B) picked up under 10 micrograms.3PubMed Central. The efficiency of contact lens care regimens on protein removal from hydrogel and silicone hydrogel lenses That is a difference of more than 200-fold between the highest and lowest depositors. Silicone hydrogel lenses did not differ much from each other in total protein, but all of them accumulated far less than conventional hydrogels.4PubMed. The influence of surface treatment on hydrophobicity, protein adsorption and microbial colonisation of silicone hydrogel contact lenses
There is a tradeoff, though. Conventional hydrogel lenses absorb a lot of lysozyme, but much of it stays active and retains its natural bacteria-fighting ability. Silicone hydrogels accumulate less protein overall, but a higher proportion of what they do attract may become denatured, which means it sits on the surface as biologically useless gunk that can irritate your eye. So wearing silicone hydrogel lenses does not mean you can skip cleaning, even though the raw numbers look lower.
Rubbing Is the Single Most Effective Thing You Can Do
If you take away one thing from this article, it should be this: rub your lenses. The “no-rub” labeling on many multipurpose solutions has led a lot of people to believe that soaking alone is enough. The research strongly disagrees. In a direct comparison, lenses cleaned with a rub step scored a median deposit grade of 0.5 on a standardized scale, while lenses cleaned with two different no-rub methods scored a median of 4.0, which represents heavy visible deposits.5PubMed. Soft contact lens cleaning: rub or no-rub? That is an eightfold difference in deposit grading just from 20 seconds of gentle rubbing with your fingertip.
The technique is straightforward. Place the lens in your palm, add a few drops of your cleaning solution, and gently rub the lens back and forth (not in circles, which can tear it) for about 20 seconds per side. Then rinse with fresh solution before placing the lens in your case. This mechanical action physically dislodges protein and lipid deposits that soaking alone cannot dissolve. Even when passive soaking in a cleaning solution does remove some deposits, the amounts removed without rubbing are consistently lower across every solution and lens type studied.6International Contact Lens Clinic. Cleaning capability of citrate-containing vs. non-citrate contact lens cleaning solutions: An in vitro comparative study
Hydrogen Peroxide Systems vs. Multipurpose Solutions
After rubbing, the type of solution you soak your lenses in makes the next biggest difference. Hydrogen peroxide-based systems and multipurpose solutions (MPS) both work, but they handle protein differently.
Hydrogen peroxide systems use a 3% peroxide solution that bubbles and oxidizes deposits during a neutralization cycle, usually involving a catalytic disc in a special case. One study found peroxide systems removed up to about 40% of deposited protein from soft lenses compared to untreated controls.7PubMed. Protein removal from soft contact lens using disinfection/neutralization with hydrogen peroxide/catalytic disc On high-deposit hydrogel lenses like etafilcon A, peroxide removed about 24% of lysozyme after 14 days, compared to roughly 16% for both rub and no-rub multipurpose solutions.3PubMed Central. The efficiency of contact lens care regimens on protein removal from hydrogel and silicone hydrogel lenses For albumin, however, all three cleaning methods performed similarly, removing over half of the deposited albumin regardless of the approach.
That asymmetry makes sense when you consider that lysozyme absorbs deep into the bulk of hydrogel lenses, where passive soaking has a harder time reaching it, while albumin tends to sit on the surface where it is more accessible to any solution. The practical takeaway: if you wear conventional hydrogel lenses and notice hazy deposits building up faster than you would like, switching to a hydrogen peroxide system may help. If you are already on silicone hydrogels, where total protein is much lower to begin with, the difference between peroxide and MPS is less pronounced. The interaction between solution chemistry and lens polymer is complex enough that results genuinely vary by brand.8PubMed. Impact of Lens Care Solutions on Protein Deposition on Soft Contact Lenses
One thing to keep in mind with peroxide systems: you must wait for the full neutralization cycle (usually at least six hours) before putting the lenses in your eyes. Unneutralized hydrogen peroxide on your eye is extremely painful. The disc or tablet in the case converts the peroxide to water and oxygen over time, so do not rush the process or swap in a regular lens case.
Enzymatic Cleaners for Stubborn Deposits
For lenses with heavier protein buildup, enzymatic cleaners offer a more aggressive treatment. These products contain enzymes, typically either papain (derived from papaya) or subtilisin A (a bacterial protease), that break down protein molecules into smaller fragments that can then be rinsed away. They are usually sold as tablets that you dissolve in saline or your regular solution, then soak the lenses for a set period.
A head-to-head comparison of the two main enzyme types found that subtilisin A was better at removing light deposits, while papain was more effective on medium and heavy deposits.9International Contact Lens Clinic. A comparison study of enzymatic cleaners: Papain versus subtilisin A In practice, this means the choice between them may depend on how much buildup you are dealing with. Most eye care professionals recommend enzymatic cleaning once a week for reusable lenses, though the specific schedule should follow whatever your lens manufacturer and eye doctor advise.
Enzymatic cleaners have become less common in recent years as daily disposable lenses have gained market share and replacement schedules have shortened. But if you wear extended-wear or monthly lenses and find that your daily cleaning routine is not keeping up, asking your eye care provider about adding a weekly enzymatic step is worth considering.
Protein Deposits and Infection Risk
Protein on your lenses does more than cloud your vision. It can actually make your lenses more hospitable to bacteria. Research on albumin-coated lenses found that as the amount of albumin on a hydrogel lens increased, so did the number of bacteria that adhered to its surface. Pseudomonas aeruginosa, a bacterium that can cause serious eye infections, showed increased adhesion on albumin-coated lenses, with bacteria tending to cluster around the protein deposits themselves.10Optometry and Vision Science. Modulation of Bacterial Adhesion to Hydrogel Contact Lenses by Albumin
This means that every day you wear lenses with accumulated protein, you are giving bacteria more footholds. Combined with a compromised tear film (which happens during lens wear) and any small scratches on the cornea, the infection risk goes up. Keeping lenses clean is not just about comfort and clarity; it is a genuine infection-prevention measure.
Daily Disposables as the Path of Least Resistance
The simplest way to deal with protein buildup is to throw the lens away before deposits become a problem. Daily disposable lenses are designed to be worn once and discarded, so protein never has time to accumulate to meaningful levels. Research comparing one-day disposables to 15-day replacement lenses found that protein deposits were significantly greater on the longer-wear lenses at every time point measured.11Cornea. Bacterial Load and Protein Deposits on 15-Day Versus 1-Day Disposable Hydrophilic Contact Lenses
If you are someone who struggles with deposit buildup despite diligent cleaning, or if you have a history of contact lens-related irritation or allergies, switching to dailies may solve the problem more reliably than any cleaning regimen. The cost per lens is higher, but you eliminate the expense and hassle of solutions, cases, and enzymatic cleaners. For people who wear lenses only a few days a week, dailies are often the most economical option anyway.
That said, dailies are not immune to deposits during a single day of wear. Protein starts accumulating within hours, and by the end of a long day, some surface deposition will be present. The difference is that you never carry yesterday’s deposits into today. Each morning is a fresh start.
How Makeup and Skincare Products Make Things Worse
Cosmetics add another layer of contamination on top of your tear film’s natural deposits. Mascara, in particular, can physically alter the shape and fit of your lenses. One study found that exposure to mascara increased the sagittal depth of silicone hydrogel lenses, meaning the lens bowed outward, by measurable amounts across all lens types tested. Makeup removers also caused lenses to swell in diameter, with increases of up to a third of a millimeter in some lens-remover combinations.12PubMed. The Impact of Cosmetics on the Physical Dimension and Optical Performance of Contemporary Silicone Hydrogel Contact Lenses
These dimensional changes affect how the lens sits on your eye, which can create areas of tighter or looser fit and alter your vision. Cosmetic residues also provide additional organic material for bacteria to feed on. If you wear contacts and use eye makeup, a few habits help reduce the problem:
- Insert lenses first: put your contacts in before applying any eye makeup, so particles are less likely to get trapped under the lens.
- Remove lenses first: take your contacts out before using makeup remover, since oily removers can absorb into the lens material.
- Avoid waterproof formulas: waterproof mascara and eyeliner contain waxes and silicones that are harder to remove from lens surfaces than water-soluble formulas.
- Skip the inner lid line: applying eyeliner to the waterline puts product directly into your tear film, which coats the lens almost immediately.
Newer Lens Technologies That Resist Deposits
Lens manufacturers are increasingly designing materials that resist protein and lipid deposition in the first place, rather than relying solely on cleaning. One promising approach involves coating silicone hydrogel lenses with MPC (2-methacryloyloxyethyl phosphorylcholine) polymers, which mimic the phospholipid structure of cell membranes. Because these coatings are extremely hydrophilic and resist the nonspecific adsorption of proteins, they make it harder for tear film components to stick.13ACS Applied Bio Materials. Biomimetic-Engineered Silicone Hydrogel Contact Lens Materials
A broader review of lens material advances found that self-lubricating lenses, nanogel-based surfaces, and anti-deposition coatings all showed promise for reducing protein and lipid deposits while improving comfort and wearability.14PubMed Central. Meta-Analysis of Materials and Treatments Used in Contact Lenses: Implications for Lens Characteristics Some of these technologies are already in commercially available lenses, while others remain in development. If you are fitting new lenses and deposit buildup has been a recurring problem, it is worth asking your provider about lens materials specifically designed to resist fouling.
A Practical Cleaning Routine
Pulling all of this together, here is what actually works for managing protein buildup on reusable contact lenses, in order of importance:
- Rub every time: 20 seconds of gentle back-and-forth rubbing per side in fresh solution removes far more deposits than soaking alone, regardless of what your solution label says about “no-rub.”
- Use fresh solution nightly: never top off old solution in your case. Dump it out, fill with fresh solution, and let the lenses soak for the full recommended time.
- Consider peroxide for heavy depositors: if you wear conventional hydrogel lenses or notice persistent haze, a hydrogen peroxide system removes more protein than most multipurpose solutions.
- Add an enzymatic step if needed: for monthly lenses or lenses with visible deposits, a weekly enzymatic tablet soak can break down what daily cleaning misses.
- Replace your case monthly: biofilm builds up inside lens cases over time, recontaminating lenses that you just cleaned.
- Stick to the replacement schedule: wearing lenses past their intended lifespan is the single biggest contributor to heavy protein deposits. A two-week lens worn for a month has accumulated far more protein than any cleaning routine can fully remove.
When Protein Activity on the Lens Is a Good Thing
One genuinely surprising finding in the research is that not all protein on your lenses is bad. Lysozyme is an antimicrobial enzyme, and on certain lens materials, it retains its ability to kill bacteria even after depositing. On etafilcon A lenses, for example, the total active lysozyme measured over 500 micrograms per lens, with both surface and bulk activity contributing. On other materials like nelfilcon, all of the active lysozyme was found on the surface, while on polymacon, it was all in the bulk.15Contact Lens and Anterior Eye. Surface versus bulk activity of lysozyme deposited on hydrogel contact lens materials in vitro
This means that lenses with high protein deposition are not necessarily the worst performers from a health standpoint, at least when it comes to fighting bacteria. The ionic hydrogel lenses that absorb the most lysozyme also tend to preserve its antimicrobial function, creating something like a built-in defense layer. Silicone hydrogel lenses, with their lower overall protein uptake, may paradoxically have less of this natural protection. The relationship between deposit quantity, protein activity, and real-world infection risk is more nuanced than “less protein equals safer lens,” and it is an area where the science is still catching up to the marketing.
For you as a wearer, this does not change the practical advice. You should still clean your lenses thoroughly and replace them on schedule. But it does explain why eye care professionals do not always recommend the lowest-depositing lens material by default. The interplay between what sticks to a lens and how it behaves once it is there adds a layer of complexity that goes well beyond what you can see with the naked eye.