What Happens if Contact Lenses Dry Out: Essential Guide for Contact Wearers

You need to know what happens if contact lenses dry out. Your eye health and comfort depend on it. Dried contacts become brittle and prone to tears. Wearing them substantially increases your risk of eye infections, corneal scratches and serious complications. Bacteria harbor in cracks that form in dried lenses and lead to conditions like conjunctivitis, keratitis and staph infections. This piece covers whether you can rehydrate contact lenses, the risks of wearing dry contacts and best practices to prevent your lenses from drying out.

What Happens When Contact Lenses Dry Out

Contact lenses rely on moisture to maintain their structure and function on your eye. A cascade of physical and chemical changes begins that compromises both the lens's integrity and your eye's safety when water evaporates from the lens material.

Physical Changes to the Lens Material

Water evaporation causes the hydrogel material to shrink and become brittle. The lens becomes prone to tears, breaks and cracks that may not be visible to your naked eye because of this brittleness. The drying process creates microscopic damage on the lens surface and forms tiny fissures and structural weaknesses. These microscopic flaws create rough, abrasive surfaces that can harm your cornea during insertion or while you blink. They aren't just cosmetic problems. The material has undergone irreversible changes at the molecular level even if a dried contact lens appears intact upon visual inspection.

Loss of Flexibility and Shape

The lens no longer maintains its original form as it loses moisture. The material warps and changes shape in ways that affect how the contact sits on your eye. Dehydration changes the contact lens's flexibility and its oxygen transmission and lens fit. You might attempt to rehydrate a dried lens by soaking it in solution. But the hydrogel material rehydrates unevenly. Lens shape and fit undergo subtle but problematic changes because of this uneven moisture absorption. The lens behaves like a dried sponge after rewetting. It might absorb liquid again, but it won't have the same properties as before. Your vision quality and lens comfort take a hit from these shape alterations and potentially cause blurred or distorted vision even after rehydration attempts.

Risk of Contamination from Surfaces

A lens that dried in a clean case presents nowhere near the risk of one found on a bathroom counter or desk. Bacteria and dust attach to the surface at alarming rates when you leave your contact lens exposed to open air. Any surface outside your lens case harbors bacteria that contaminate the lens quickly, whether a sink, kitchen floor or the bottom of your bag. Invisible contaminants make their way onto exposed lenses from environmental debris in addition to external bacteria. Water contact poses particular danger. Tap water contains microorganisms like Acanthamoeba that can cause severe, sight-threatening infections. The microscopic cracks formed during drying create perfect hiding spots where bacteria can embed themselves and make disinfection nearly impossible.

Protein and Mineral Deposits

Your tears contain proteins like lysozyme and albumin, along with minerals such as calcium. These substances don't disappear as a lens dries. Minerals from your tears crystallize on the lens surface and create hard white spots that look clear or chalky. These calcium and mineral deposits form over time and feel rough or gritty against your eye. The drying process concentrates tear proteins and lipids on the lens surface, where they become denatured and form stubborn deposits. These protein deposits can trigger inflammatory responses in your eye, including conditions like giant papillary conjunctivitis. Standard cleaning solutions cannot remove them once mineral deposits form on soft lenses, and the lens should be replaced. The spots persist even after rehydration attempts and continue irritating your eye with every blink.

Can You Rehydrate Contact Lenses

Dried contact lens rehydration remains one of the most debated topics among contact wearers. The answer isn't straightforward. You might rehydrate soft contact lenses with success sometimes, but disposal is the only safe option other times.

When It Might Be Safe to Rehydrate

The way your lens dried out determines whether rehydration is safe. You might be able to rehydrate the lens if the solution in its case evaporated and the lens stayed free from contaminants, dust, or unclean surfaces. You also need to know the exact time it's been dry. A lens that dried in a clean case presents a safer scenario than one found on a bathroom counter or desk. Time matters because longer and more severe dehydration reduces the rehydration's chances of success. Lenses with higher water content lose moisture faster. Environmental factors like low humidity and increased airflow speed up drying. The location makes a vital difference for your eye safety.

When You Should Throw Dried Contacts Away

You should throw away dried lenses instead of trying to rehydrate them in these cases:

1. You found the lens exposed on a countertop, desk, or bathroom sink
2. You don't know how long it's been exposed to air
3. The lens shows visible damage like cracks or tears
4. It stays stiff or uneven after soaking

Your dried-out contacts were not protected from bacteria, scratches, or cracking, so you would never want to re-wear them. Eye care professionals give clear advice: if you're unsure about a dried contact lens, throw it away. A new pair costs much less than treating an eye infection or injury.

How to Rehydrate a Contact Lens Safely

A contact lens rehydration involves soaking it in a proper disinfecting solution. The hydrogel material reabsorbs the lost moisture. But this rehydration is not a perfect revival. The lens may not rehydrate evenly. This causes subtle changes in its shape and fit.

Wash your hands well with mild soap and rinse off all soap residue. Clean your contact lens case, then place the lens in and fill to the brim with fresh multipurpose solution. Only use fresh, unexpired multipurpose contact lens solution. Never use tap water, saliva, or expired solution. Eye care professionals suggest soaking times between 2 to 24 hours. Let severely dried lenses soak longer, preferably overnight.

Inspect the lens with care before putting it in your eye. Dr. Joe Wende, Medical Director for ContactsDirect, says, "If you rehydrate a contact lens, be sure to use every precaution when wearing it next. Inspect it closely for any small tears at the edges, any scratches on the lens, or any signs of contamination or buildup". Remove it right away if any discomfort occurs.

Risks of Wearing Dried Out Contacts

Dried out contacts put your eyes at serious risk for infections, injuries and lasting damage. The physical changes to dried lenses create multiple pathways for harm. Consequences range from temporary discomfort to permanent vision loss.

Eye Infections and Bacteria

Bacterial keratitis ranks as the most common infection among contact lens wearers. Harmful bacteria like Pseudomonas aeruginosa and Staphylococcus aureus multiply fast on contaminated lenses and invade your cornea. They cause serious damage if left untreated. The infection develops when you wear lenses too long, fail to clean them or expose them to contaminated surfaces. Even small scratches from a poorly fitting or dried lens create openings for bacteria to enter.

Fungal keratitis presents a less common but more difficult challenge to treat. Fungi like Fusarium and Aspergillus attach to contact lenses and penetrate your cornea. They develop slowly and often resist standard antibiotic treatments. Acanthamoeba keratitis is a very serious infection caused by microscopic organisms found in tap water, swimming pools and hot tubs. This organism causes severe pain when trapped between your dried contact lens and eye. It requires months of intensive treatment with specialized medications. Over 23,000 people are estimated to be diagnosed with Acanthamoeba keratitis around the world each year.

Studies estimate that about 50% of contact lens wearers experience dry eye symptoms. The frequency of contact lens related dry eye reaches about 50%. This makes it a growing public health problem and one of the most frequent reasons for seeking ophthalmologist intervention.

Corneal Scratches and Abrasions

Lenses that dry out become brittle and grow more susceptible to scratches and tears. The same holds true for your eyes when you wear dried out contact lenses. The brittle, deformed lens material scratches your corneal surface with each blink. Corneal abrasions occur when the lens scratches the cornea and causes discomfort and potential vision issues. Contact lens related abrasions are defects in the corneal epithelium left behind after removing an overworn, improperly fitting or improperly cleaned contact lens.

Small abrasions heal within 24 to 48 hours. Larger scratches may take longer and risk complications including keratitis, corneal ulcers and iritis. Eye scratches that don't heal up or don't respond to treatment could lead to infections or scarring. Both could cause loss of vision.

Blurred Vision and Discomfort

Dryness is the most common symptom of discomfort in contact lens wearers. Related symptoms of grittiness, scratchiness and foreign body sensations are also reported often. You often experience visual disturbance and blurred vision due to changes associated with dry eyes. Discomfort and desiccation symptoms are the main reasons for contact lens intolerance, a reduction in wearing time and eventual discontinuation.

Long-Term Eye Health Complications

Decreased corneal sensitivity is one of the more concerning long-term effects. The nerves in your cornea become less responsive over time due to constant contact lens wear. This means you may not feel irritation or injury as fast. Small issues can go unnoticed and worsen, and healing responses may be delayed. Chronic oxygen deprivation can alter corneal thickness and potentially affect overall eye health and visual clarity. Contact lens induced dry eye can cause corneal inflammation, scarring or raise the risk of eye infections without proper management.

How to Prevent Contact Lenses from Drying Out

Preventing your contact lenses from drying out requires consistent daily habits and proper care routines. These practices protect both your lenses and your eyes from the complications that dried contacts create.

Store Lenses in Fresh Solution Daily

Fill your contact lens case with fresh solution each time you store your lenses. Old solution loses its disinfectant power when reused or topped off. Never add new solution to old solution, as this introduces bacteria into the mix. Always discard used solution before adding fresh solution instead. Fresh solution remains your best defense for cleaning and reducing contamination risks. Some solutions maintain disinfecting power for only 24 hours of storage, while others can store lenses for up to one month. Check your solution manufacturer's instructions for specific storage time limits.

Keep Your Contact Lens Case Clean

Empty any used solution from your case after removing your lenses. Rinse the case with fresh contact lens solution, not water. You should also clean the cap with solution after rinsing the wells. Place the case and caps face down on a clean tissue to air dry overnight. Never use a towel or tissue paper to dry the case, as this could contaminate or scratch the lens surface. Moisture creates a breeding ground for bacteria, so letting your case dry out proves significant. Keep your cleaned case out of the bathroom, as flushing the toilet propels tiny bacteria droplets many feet from the toilet and contaminates your case.

Never Use Water or Saliva

Water contains microorganisms that can harm your eyes. Tap water transports pathogens such as Acanthamoeba and causes life-threatening infections. Even filtered water doesn't work for disinfecting your lenses. Contact lenses absorb water and swell because tap water isn't salty like tears. This swelling creates microscopic breaks in your cornea that microorganisms can penetrate and create infections. Saliva contains bacteria that belongs in your mouth, not your eye. You might as well place your contacts in a petri dish if you put them in your mouth.

Replace Your Case Every 3 Months

Eye care professionals recommend replacing your contact lens case every three months. Contact lens cases accumulate bacteria over time, no matter how well you clean them. Contamination affects 30% to 85% of contact lens cases. Replace damaged or cracked cases right away, as even small cracks allow bacteria to enter. If you notice any cracks or discoloration, replace the case even if it's been less than three months.

Remove Contacts Before Sleeping

Your eyes lose oxygen flow and moisture when you sleep in contacts. This oxygen deprivation causes your lens to tighten on your eye and creates microscopic rips to the cornea. Microorganisms can enter through those corneal tears and lead to infection. Some contact lenses have FDA approval for overnight wear, but consult your doctor before you get such prescription lenses.

Best Practices for Contact Lens Care

Building proper habits around contact lens handling prevents the complications that dried out contacts create. These practices protect your lenses from contamination and keep your eyes healthy during wear.

Wash Your Hands Before Handling Contacts

Poor hand hygiene ranks among the top risk factors for microbial contamination of contact lenses. The risk of microbial keratitis increases 13 times for wearers who don't wash their hands, studies show. Here's what's alarming: 41% of contact lens wearers don't wash their hands before insertion, despite 88% knowing bacteria transfers from fingers to eyes. Research found 90% of disease load on daily disposable lenses came from wearers who failed to wash their hands. Wash with mild soap free from lanolin or moisturizers and scrub for at least 15 seconds. Dry with a clean, lint-free towel before touching your contacts.

Use Only Recommended Contact Solution

Use only solutions your eye doctor approves. Multi-purpose solutions clean, disinfect, rinse and store your lenses in one bottle. Never use rigid gas permeable solutions for soft lenses. Each lens type requires specific formulations. Hydrogen peroxide systems provide deeper cleaning and suit sensitive eyes, but require 4 to 6 hours of soaking time.

Daily Cleaning and Proper Storage

Rub each lens for about 20 seconds on each side with multipurpose solution. Rinse for about 10 seconds per side with fresh solution. Soak lenses according to the manufacturer's instructions, usually between four and eight hours.

Managing Dry Eyes with Contacts

Preservative-free artificial tears moisturize your eyes without damaging lenses. Apply drops before insertion and reapply every 2 to 3 hours throughout the day. Stay hydrated by drinking plenty of water to support tear production.

Conclusion

Dried contact lenses pose serious threats to your eye health, from bacterial infections to corneal damage. Prevention through proper daily care remains your best defense against these complications. Store your lenses in fresh solution, keep your case clean, and replace it every three months.

You should err on the side of caution if you find a dried lens. A new pair costs nowhere near as much as treating an infection or corneal injury. Your eyes deserve protection. The care practices outlined here will keep your lenses comfortable and safe to wear every day.

FAQs

Q1. Is it safe to wear contact lenses after they've dried out? No, you should not wear contact lenses after they've dried out. When lenses dry, they become brittle and can develop microscopic cracks that aren't visible to the naked eye. These cracks can harbor bacteria and may scratch your cornea, leading to infections, corneal abrasions, and other serious eye complications. Even if the lens appears intact after rehydration, the material has undergone irreversible changes that compromise both safety and comfort.

Q2. Can dried contact lenses be rehydrated and used again? In some cases, lenses can be rehydrated if they dried in a clean, sealed case and haven't been exposed to contaminants. However, if the lens was exposed to surfaces like countertops or sinks, or if you're unsure how long it's been dry, you should discard it. Even successfully rehydrated lenses may not return to their original shape and fit, potentially causing vision problems and discomfort. When in doubt, it's safer to replace them with a new pair.

Q3. How do you properly rehydrate a dried contact lens? To rehydrate a lens safely, first wash your hands thoroughly with mild soap. Place the lens in a clean contact lens case and fill it completely with fresh, unexpired multipurpose solution—never use tap water or saliva. Let the lens soak for 2 to 24 hours, with severely dried lenses requiring overnight soaking. Before wearing, carefully inspect the lens for any tears, scratches, or signs of contamination, and remove it immediately if you experience any discomfort.

Q4. What are the risks of wearing dried out contact lenses? Wearing dried out contacts can lead to serious complications including bacterial, fungal, or Acanthamoeba infections that may cause permanent vision loss. The brittle lens material can scratch your cornea with each blink, causing painful abrasions. You may also experience blurred vision, discomfort, and chronic dry eye symptoms. Long-term complications include decreased corneal sensitivity, altered corneal thickness, and increased risk of inflammation and scarring.

Q5. How can I prevent my contact lenses from drying out? Store your lenses in fresh solution daily and never reuse or top off old solution. Keep your contact lens case clean by rinsing it with fresh solution (not water) and letting it air dry completely. Replace your case every three months to prevent bacterial buildup. Always remove your contacts before sleeping, and never use water or saliva on your lenses. Following these practices will keep your lenses properly hydrated and safe to wear.