Eye care professionals see the same mistakes walk through their doors every single day. Not from careless people, but from perfectly well-intentioned wearers who simply did not know that what they were doing was putting their eyes at risk.
Contact lenses are safe when used correctly. The problems start when small habits, topping off solutions, sleeping in lenses, skipping a clean compound over time into something more serious. This guide covers the ten mistakes optometrists see most often, and exactly how to avoid every one of them.
1. Using Water to Clean or Store Contact Lenses
What are the most common mistakes people make with contact lenses?
Ask any eye care professional and water will be near the top of the list every time.
Tap water, bottled water, and distilled water all look clean. None of them are sterile. Tap water in particular contains a microscopic organism called Acanthamoeba that is harmless in most contexts but devastating when trapped between a contact lens and your cornea. The resulting infection, Acanthamoeba keratitis, causes intense pain, extreme light sensitivity, and in serious cases, permanent corneal scarring that no amount of treatment can fully reverse.
This rule applies to rinsing lenses, storing lenses, and rinsing the lens case. None of these should ever involve water of any kind. If you run out of solutions, the right answer is to leave your lenses out until you can purchase more, not to improvise.
2. Skipping Daily Cleaning and Disinfection
How to clean contact lenses properly and why skipping even once matters?
The moment a contact lens goes onto your eye, an accumulation process begins. Your tear film deposits proteins and lipids onto the lens surface. Airborne bacteria and environmental debris attach themselves throughout the day. By the time you remove your lenses in the evening, this invisible build-up is significant.
Skipping your cleaning routine even occasionally allows this build-up to compound. Protein deposits that are not removed harden into a film that changes how the lens feels and how clearly it performs. Bacteria that are not eliminated by a proper contact lens cleaning solution have a warm, moist environment to multiply overnight.
The rub and rinse method remains the gold standard regardless of whether your solution claims to be no-rub. Place the lens in your palm, apply fresh solution, rub gently for ten to fifteen seconds on each side, then rinse with fresh lens cleaning solution before storing. This mechanical action removes deposits that soaking alone cannot address.
3. Reusing Old Contact Lens Solution
Is it bad to top off old contact lens solution in the case?
It is one of the most common habits in contact lens care and one of the most genuinely risky ones.
When you pour multipurpose solution into your lens case and leave your lenses to soak overnight, the disinfecting agents in that solution are doing their job. By morning, those active ingredients have been chemically depleted by the disinfecting process. The solution sitting in your case is no longer at full potency.
Adding a small amount of fresh solution to this spent liquid does not restore its effectiveness. It dilutes what is already there and mixes fresh with depleted chemistry in a ratio that cannot be predicted or controlled. Bacteria that the original solution would have eliminated can survive in this weakened mixture and colonise your lens surface overnight.
The correct habit is non-negotiable. Empty the case completely every morning. Rinse with fresh solution. Leave it to air dry face down. Refill with a completely fresh solution every evening.
4. Not Cleaning the Lens Case Properly
How often am I supposed to replace my contact lens case?
This is a question most wearers have never thought to ask, because the case looks the same from one month to the next.
Replace your lens case every three months at minimum. Many eye care professionals recommend replacing it each time you open a new bottle of solution, which creates a natural and easy-to-follow schedule. A case that appears visually clean can harbour a biofilm, a thin layer of bacteria and organic matter that adheres to the case surface and resists ordinary rinsing.
Between replacements, the daily maintenance routine for your case is straightforward. After inserting your lenses each morning, empty all remaining solution from the case. Rinse both compartments with fresh multipurpose solution, never tap water. Wipe with a clean tissue and leave the case open and face down to air dry completely before the next use.
A contaminated case undermines every other good habit you have. Even the best contact lens solution cannot fully compensate for lenses being stored in a case that is actively breeding bacteria.
5. Sleeping With Contact Lenses
Why shouldn’t I sleep with my contact lenses on?
Unless your optometrist has specifically prescribed extended-wear lenses and explicitly told you they are safe for overnight use, sleeping in your lenses multiplies your infection risk significantly.
During sleep, your eyelids are closed and the normal flow of oxygen and fresh tears to your cornea is already reduced. A contact lens sitting on your cornea throughout this period further restricts oxygen supply and prevents the natural tear film from flushing the lens surface. The warm, dark, low-oxygen environment created under a closed eyelid with a lens in place is close to ideal for bacterial growth.
Contact lens overwear syndrome is a recognised condition that develops from consistently wearing lenses for longer than recommended, including through sleep. Symptoms include persistent redness, a gritty uncomfortable feeling, sensitivity to light, and in more serious cases, changes to the corneal surface that can make lens wear difficult long term.
If you fall asleep accidentally with your lenses in, remove them as soon as you wake up, give your eyes time to breathe without lenses, and monitor for any redness or discomfort. If symptoms persist, consult your eye care professional.
6. Wearing Lenses Beyond the Recommended Time
Every contact lens type has a replacement schedule that exists for a specific reason. Daily disposables are designed to be worn once and discarded. Bi-weekly lenses are engineered for a maximum of two weeks of use. Monthly lenses have a 30-day lifespan from first opening.
These timelines are not conservative suggestions. They reflect the point at which the lens material itself begins to degrade, deposit build-up becomes too significant to fully address through cleaning, and the risk of irritation and infection increases meaningfully.
Stretching your replacement schedule might seem economical. In practice, it trades a small saving on lens cost for a meaningfully elevated risk of eye problems that are both uncomfortable and potentially expensive to treat.
7. Handling Lenses With Dirty Hands
This is one of the simplest mistakes to avoid and one of the most consistently seen. Wash your hands thoroughly with mild, non-cosmetic soap before handling your lenses every single time. Not a quick rinse. A proper wash of at least twenty seconds.
Equally important and equally overlooked is drying your hands completely before touching your lenses. Wet hands introduce water to the lens handling process, which carries the same contamination risks as any other water contact.
Use a clean, lint-free cloth or tissue to dry your hands. Fluffy towels shed fibres that can transfer to lenses and cause irritation during wear.
8. Using Expired Contact Lens Solution
The expiry date on your contact lens solution bottle is not a conservative estimate designed to make you buy more product sooner. It marks the point at which the chemical stability of the disinfecting agents can no longer be guaranteed by the manufacturer.
Past this date, the active ingredients that kill bacteria and protect your eyes may have degraded beyond effective concentrations. The pH of the solution may have shifted outside the range that is comfortable and safe for eye contact. Using expired solution gives you a false sense of security while potentially providing inadequate or no disinfection at all.
Check the date before every use. If the bottle has expired, replace it regardless of how much solution remains. This applies to solutions that have been opened and used regularly as well as bottles that have been sitting unused, since the chemistry degrades with time from the moment of manufacture.
9. Ignoring Eye Discomfort or Redness
What happens if you leave your contacts in the case for too long?
Lenses left in solution for extended periods beyond the recommended soaking time accumulate contamination risk as the solution’s disinfecting potency wanes. But the more important version of this question is what happens when you ignore what your eyes are telling you during wear.
Discomfort during lens wear is your eye’s way of communicating that something is wrong. A scratchy feeling, increasing redness throughout the day, sensitivity to light, or a sudden awareness of the lens that was not there in the morning are all signals worth taking seriously.
The appropriate response to any of these symptoms is to remove your lenses and assess. If symptoms resolve quickly after removal, the issue may be minor, a displaced lens, some surface debris, or the beginning of end-of-day dryness. If redness, pain, or sensitivity persists after removing your lenses, that is a clear prompt to contact your eye care professional rather than wait and see.
Contact lens eye infection symptoms including intense pain, significant discharge, extreme light sensitivity, or sudden vision changes require prompt professional attention. Early treatment consistently produces better outcomes than delayed treatment.
10. Not Following Eye Care Professional Advice
Your optometrist has examined your specific eyes, assessed your tear film quality, measured your corneal curvature, and prescribed both a lens type and a care routine based on that individual assessment. Their recommendations are not generic suggestions that can be adapted based on convenience.
Switching solution brands without checking compatibility with your lens type, extending your replacement schedule, skipping follow-up appointments, or continuing to wear lenses despite recurring discomfort are all ways that otherwise careful wearers undermine the professional guidance they have received.
Follow-up appointments exist for a reason. Your eyes change over time. A lens that fitted well two years ago may not be optimal today. A solution that worked well initially may not be the best match for your current eye health. Regular reviews keep your lens prescription and care routine aligned with where your eyes actually are.
Multisol+ by Gaymed Labs
Multisol+ is a multipurpose contact lens solution from Gaymed Labs designed to support a proper daily lens care routine, cleaning, rinsing, disinfecting, and storing soft contact lenses in one straightforward product. Manufactured in a GMP and ISO 13485-certified facility with over 30 years of optical care expertise, it is the kind of solution that makes doing things right easy to maintain consistently.
Conclusion
Every mistake on this list is common, understandable, and entirely preventable. None of them require significant time or expense to avoid. They require awareness and consistency.
Fresh solution every day. Clean hands every time. Case replaced every three months. Lenses discarded on schedule. Eyes listened to when they signal discomfort. These habits are the difference between contact lens wear that is safe and comfortable long term and one that quietly accumulates risk over months and years.
Your eyes are worth the two minutes it takes to get this right every single day.
Frequently Asked Questions
1. What are the most common mistakes people make with contact lenses?
The most frequently seen mistakes include using water to rinse or store lenses, topping off old solution instead of replacing it completely, sleeping in lenses not approved for overnight wear, neglecting lens case hygiene, and ignoring early signs of discomfort or redness. Each of these individually increases risk. Combined, they create a significantly elevated chance of irritation or infection.
2. Is it bad to top off old contact lens solution in the case?
Yes. Disinfecting agents in contact lens solution are depleted during their first use cycle. Adding fresh solution to spent solution creates a diluted mixture that cannot reliably eliminate bacteria. Always empty the case completely, rinse with fresh solution, and refill entirely with new solution every evening.
3. How often am I supposed to replace my contact lens case?
At minimum, every three months. Many eye care professionals recommend replacing the case each time you open a new bottle of solution. Even a case that looks visually clean can harbour a biofilm of bacteria and organic matter that ordinary rinsing does not fully address.
4. What happens if you leave your contacts in the case for too long?
If lenses are left in solution beyond the recommended soaking period, the disinfecting potency of the solution wanes and contamination risk increases. If lenses have been in a case for longer than 30 days, perform a fresh rub and rinse with new solution and soak overnight before wearing again.
5. Why shouldn’t I sleep with my contact lenses on?
Sleeping in standard contact lenses significantly reduces oxygen supply to the cornea, prevents natural tear film renewal, and creates a warm, low-oxygen environment that is conducive to bacterial growth. Unless your optometrist has specifically prescribed extended-wear lenses for overnight use, sleeping in lenses meaningfully increases your risk of developing a corneal infection.