You can attempt to rehydrate a dried-out contact lens by soaking it in fresh multipurpose contact lens solution for several hours, but there’s no guarantee the lens will be safe to wear afterward. Drying fundamentally changes a contact lens’s shape, surface, and sterility. Whether the lens is salvageable depends on how long it was dry, what type of lens it is, and whether the structure held up during dehydration.
How to Rehydrate a Dried Contact Lens
If you’ve found a contact lens stuck to a surface or dried out in its case, place it in a clean contact lens case filled with fresh multipurpose solution. Do not use water, saliva, or homemade saline. Let the lens soak for at least 12 to 24 hours. Multipurpose solution both rehydrates and disinfects, which matters because a dried lens has been exposed to whatever was floating in the surrounding air.
After soaking, gently rub the lens between your fingers with more fresh solution to remove any debris or protein deposits that hardened onto the surface while it was dry. Then inspect it carefully before even considering putting it in your eye.
Why Tap Water Is Never an Option
It’s tempting to run a dried lens under the faucet, but tap water is one of the most dangerous things you can put on a contact lens. The U.S. Environmental Protection Agency specifically warns against this because of a microbe called acanthamoeba, which is common in tap water throughout the country. This organism has two life stages: an active form that causes infection, and a dormant cyst form that can survive on a lens surface for a long time. Once it reaches your eye, it causes severe pain, a sensation of something stuck in the eye, and a whitish ring around the edge of the cornea. The infection can last weeks to months and, according to the EPA, never fully heals despite treatment.
Sterile saline solution is also not ideal for rehydration on its own. Cleveland Clinic notes that saline isn’t a disinfectant, so it won’t kill germs on the lens. You can use saline to rinse a lens after disinfecting it with a proper cleaning solution, but saline alone won’t make a contaminated lens safe.
How to Tell if the Lens Is Ruined
Once the lens has rehydrated, hold it up to a light and look closely at both sides. You’re checking for cracks, splits, scratches, torn edges, or any visible buildup on the surface. A lens that dried out completely often warps as the water leaves the material, and rehydrating it doesn’t always restore the original curvature. If you see any physical damage at all, throw the lens away. A cracked or warped lens can scratch your cornea or trap bacteria against the eye’s surface.
If the lens looks intact, you can try wearing it, but remove it immediately if you feel any discomfort: stinging, burning, a gritty sensation, or blurred vision that doesn’t clear within a few blinks. These are signs the lens shape has changed or the surface has degraded in ways you can’t see with the naked eye.
What Drying Does to a Contact Lens
Soft contact lenses are mostly water. A typical lens is anywhere from 38% to 75% water by weight, depending on the material. That water isn’t just filler. Oxygen reaches your cornea by passing through free water molecules in the lens material. When a lens dries, those molecules leave the matrix, and rehydration doesn’t always restore them to their original arrangement. The result can be a lens that looks normal but transmits less oxygen to your eye, increasing the risk of corneal swelling or irritation during wear.
The dehydration cycle also affects the lens’s surface chemistry. Proteins and minerals from your tears or the environment bond more tightly to the lens material as it dries, creating attachment sites that are hard to clean off. This is why a rehydrated lens sometimes feels gritty or uncomfortable even when it looks clean.
What Eye Doctors Actually Recommend
The American Academy of Ophthalmology’s position is blunt. One ophthalmologist responding on the AAO’s official site said, “I certainly would not even think about it for my eyes.” The reasoning comes down to two problems you can’t solve at home. First, a dried lens has been exposed to environmental germs, and you have no way of knowing which ones. Second, multipurpose solution is a cleaning solution, not a sterilizing solution, so it doesn’t kill all microorganisms.
The structural concern is just as serious. Drying can cause invisible changes to the lens curvature and create micro-tears at the edges that are easy to miss during a visual inspection. A lens that fits differently than it was designed to can cause corneal abrasions or trap debris under the lens where you can’t feel it right away.
Rigid Lenses vs. Soft Lenses
Rigid gas permeable (RGP) lenses handle drying differently than soft lenses because they contain far less water. They’re less likely to warp dramatically, but they still need proper conditioning. Moorfields Eye Hospital recommends soaking RGP lenses overnight in the conditioning solution recommended by your eye care provider, rubbing a drop of solution over both sides before storing. If an RGP lens has dried out, soak it in its recommended conditioning solution and inspect it for scratches or chips before wearing.
The infection risks are the same for both lens types. Never rinse either type with tap water, and never store them in anything other than the solution your eye care provider recommended.
When to Just Replace the Lens
If you wear daily disposable lenses, there’s no reason to attempt rehydration. The cost of a single lens is far less than treating a corneal infection. For monthly or biweekly lenses, the calculus shifts slightly since replacement is less convenient, but the risk remains the same. Any lens that was dry for more than a few hours has likely undergone enough structural and chemical change that rehydration is a gamble.
If the lens dried out because it fell on a counter, a floor, or any uncontrolled surface, discard it regardless of how long it was dry. The combination of physical contamination and dehydration makes it unpredictable. If it dried in a case because the solution evaporated over days or weeks, the same advice applies. The longer the lens sat dry, the less likely rehydration will restore it to a safe, comfortable state.