How you store contact lenses for an extended period depends on whether they’re soft or rigid gas permeable (RGP) lenses, and the answer is different for each. Soft lenses can sit in multipurpose solution for up to about 30 days before the solution needs replacing. RGP lenses are actually better stored completely dry. Getting this wrong isn’t just inconvenient. Lenses stored in stagnant solution can harbor bacteria, fungi, and amoebas that cause serious, sometimes vision-threatening eye infections.
Soft Lenses: The 30-Day Rule
Some multipurpose solutions allow soft contact lenses to be stored for up to one month in a tightly sealed lens case. After that window, the disinfecting agents in the solution break down and can no longer keep microbes in check. If you haven’t worn your lenses within 30 days, you need to dump the old solution, rinse the case, and fill it with fresh solution. Then let the lenses soak for the full disinfection time listed on your solution’s label before wearing them.
If you’re storing lenses for several months, you’ll need to repeat this refresh cycle every 30 days. It’s tedious, and skipping even one cycle defeats the purpose. For people who only wear contacts occasionally, daily disposables are often a better option since they come sealed in individual blister packs and stay sterile until you open them, no storage routine required.
RGP Lenses: Store Them Dry
Rigid gas permeable lenses follow the opposite logic. The American Academy of Ophthalmology recommends storing RGP lenses dry in a clean, closed lens case when you won’t be wearing them for an extended period. Solution sitting in a case for weeks or months becomes a breeding ground for bacteria and other infectious organisms, so leaving RGP lenses soaking long-term actually increases risk rather than preserving them.
When you’re ready to wear them again, clean the lenses with RGP lens cleaner, rinse them with saline, and allow them to condition in fresh solution for the recommended time before putting them in your eyes. RGP lenses are more durable than soft lenses and tolerate dry storage well without warping or degrading.
Why Old Solution Becomes Dangerous
Stagnant contact lens solution doesn’t just lose its disinfecting power. It actively becomes a hospitable environment for some of the most harmful organisms your eyes can encounter. The most common culprit in contact lens infections is Pseudomonas aeruginosa, a bacterium that forms biofilms on lens surfaces. These biofilms sit directly against your cornea when you insert the lens, trapping bacteria where your tears can’t wash them away.
Fungal infections from organisms like Fusarium and Aspergillus are also linked to poor lens storage. About 30% of contact lens wearers who develop a fungal corneal infection end up with lasting vision loss. Bacterial infections result in permanent visual impairment roughly 14% of the time.
The rarest but most devastating risk is Acanthamoeba, an amoeba found in tap water, lakes, and contaminated lens solutions. It feeds on the bacterial biofilms that form in old solution. Acanthamoeba infections are frequently misdiagnosed, which delays treatment, and they often cause severe vision loss. Treatment typically lasts anywhere from five months to a year and a half.
Your Solution Bottle Has a Clock Too
It’s not just the solution in your lens case that expires. Once you crack the seal on a bottle of multipurpose solution, it should be discarded after 90 days, even if there’s plenty left. The preservatives that keep the bottle sterile degrade after opening, and every time you touch the tip to a case or cap, you introduce potential contaminants. An unopened bottle is fine until the expiration date printed on the packaging, which is typically one to two years out.
If you’re only wearing contacts occasionally and a full bottle goes to waste, look for smaller travel-sized bottles. Using expired or long-opened solution to refresh your stored lenses completely undermines the storage process.
Practical Steps for Long-Term Storage
For soft lenses stored longer than a few days:
- Use fresh multipurpose solution every time you store or refresh lenses. Never top off old solution with new.
- Refresh every 30 days. Discard the old solution entirely, clean the case, refill with fresh solution, and resoak the lenses.
- Replace the case at least every three months. Lens cases develop biofilms even with regular cleaning.
- Never use tap water. Tap water is a primary source of Acanthamoeba and doesn’t disinfect lenses.
- Check your solution bottle’s age. If it’s been open longer than 90 days, use a new one.
For RGP lenses:
- Clean lenses thoroughly before dry storage.
- Store in a dry, closed case in a clean, room-temperature location.
- Clean, rinse, and recondition in fresh solution before reinserting after any period of dry storage.
When Storing Isn’t Worth the Effort
If your soft lenses are monthly or biweekly disposables nearing the end of their replacement cycle, storing them for weeks doesn’t make sense. The lens material degrades with use, and the risks of contamination during extended storage outweigh the cost of a fresh pair. Prescription changes also happen gradually, so lenses stored for many months may no longer match your current vision needs. For anyone who wears contacts only a few times a month, switching to daily disposables eliminates the storage question entirely since each lens comes in its own sealed, sterile pack and gets discarded after a single use.