Most eye infections are preventable with a handful of consistent habits. The biggest risk factor is also the simplest to control: your hands. People touch their faces an average of 50 times per hour, and each touch is a chance to transfer bacteria or viruses from a surface to your eyes. Keeping your hands clean and away from your eyes eliminates the most common route of infection.
Why Hand Hygiene Matters Most
Bacterial and viral conjunctivitis (pink eye) spread primarily through direct contact. You touch a contaminated doorknob, rub your eye, and the pathogen has a direct path to mucous membranes with almost no barriers. The CDC recommends washing your hands with soap and water for at least 20 seconds, especially before touching your face or handling anything that goes near your eyes. When soap isn’t available, hand sanitizer with at least 60% alcohol is a reasonable backup.
If someone in your household has pink eye, wash your hands immediately after any contact with that person or items they’ve used. Don’t share towels, pillowcases, or washcloths. Launder anything that touches the infected person’s face separately, and wash it in hot water. Pink eye viruses can survive on fabric and hard surfaces long enough to infect the next person who touches them.
How Your Eyes Protect Themselves
Your tears are more than moisture. They contain proteins that actively fight pathogens. One of these proteins breaks apart bacterial cell walls, causing the bacteria to rupture and die. Another starves bacteria by binding to the iron they need to grow, and it can also punch holes in the membranes of bacteria, fungi, and viruses. This is why a healthy tear film matters. Anything that dries out your eyes, whether it’s staring at a screen for hours, sitting under a vent, or skipping water, weakens this natural defense system. Keeping your eyes lubricated with preservative-free artificial tears helps maintain that protective barrier, especially in dry or air-conditioned environments.
Contact Lens Habits That Prevent Infection
Contact lens wearers face elevated infection risks, and one of the most serious threats illustrates why. Acanthamoeba keratitis is a painful, hard-to-treat eye infection caused by a microscopic organism found in water, including tap water, bottled water, and chlorinated swimming pools. Contact lens wearers account for at least 90% of cases. The infection typically happens when lenses come into contact with water or are stored improperly.
To reduce your risk:
- Never use tap water to rinse or store your lenses. Only use the contact lens solution recommended by your eye care provider.
- Rub and rinse your lenses with disinfecting solution each time you remove them, even if the solution label says “no-rub.”
- Don’t top off old solution. Empty the case completely, rinse it with fresh solution, and refill.
- Remove lenses before swimming or showering. If you swim regularly, consider prescription goggles.
- Don’t sleep in your lenses unless your eye care provider has specifically told you it’s safe with your particular lens type.
- Wash and fully dry your hands with a clean cloth before handling lenses. Wet hands can transfer waterborne organisms directly onto the lens surface.
Replace your contact lens case regularly. Bacteria form a sticky, resistant layer called a biofilm on plastic surfaces over time, and no amount of rinsing will fully remove it. A fresh case eliminates the buildup.
Stop Rubbing Your Eyes
Eye rubbing is one of those unconscious habits that carries real consequences. Rubbing can create tiny scratches on the cornea, the clear front surface of your eye. These micro-abrasions give bacteria and other pathogens a direct entry point past your eye’s outer defenses. Sand, dust, or any small particle trapped under your eyelid makes this worse, because rubbing grinds the particle across the cornea instead of flushing it out.
If your eyes itch from allergies or feel gritty from dryness, resist the urge to rub. Use preservative-free artificial tears to flush out irritants, or try a cool compress over closed eyelids. If allergy-related itching is frequent, over-the-counter antihistamine eye drops can reduce the urge to rub in the first place.
Eye Makeup and Infection Risk
Mascara, eyeliner, and eyeshadow sit in warm, dark containers, which is an ideal environment for bacteria to multiply. Experts recommend replacing all eye cosmetics every three to four months, even if the product still looks and smells fine. Bacterial colonies aren’t visible to the naked eye, and by the time a product seems “off,” contamination is well established.
A few additional rules help keep your makeup routine safe. Never share eye cosmetics with anyone else. Avoid applying makeup in a moving vehicle, where a slip can scratch your cornea. Don’t use saliva to moisten dried-out products. And if you develop an eye infection, throw away every eye product you used in the days before symptoms appeared. Reusing contaminated mascara or liner is one of the most common causes of reinfection after treatment clears the original problem.
Protecting Your Eyes Around Water
Water is a surprisingly common source of eye infections. Acanthamoeba, the organism behind the serious keratitis mentioned above, can survive even in treated drinking water and chlorinated pools. The disinfectant concentrations in most water sources simply aren’t high enough to kill it, particularly when it forms a protective cyst.
If you swim, wear goggles. This applies to pools, lakes, rivers, and oceans. If water splashes into your eyes, rinse them with sterile saline or artificial tears rather than more tap water. For anyone with a recent eye injury or a weakened immune system, the stakes are higher. Avoid submerging your face in any water source until the injury has fully healed.
Household Practices That Reduce Spread
Eye infections move through a household quickly when people share personal items. Towels, pillowcases, and washcloths are the most common carriers. Each family member should use their own face towel, and these should be laundered frequently in hot water. Pillowcases deserve the same attention, especially if you tend to sleep on your side with your face pressed into the fabric.
Clean eyeglasses and sunglasses regularly with soap and water or lens cleaner. Phones are another overlooked vector. Your phone screen collects bacteria from every surface you set it on, and if you press it against your cheek and temple during calls, those organisms end up close to your eyes. A quick wipe with a disinfectant-safe cloth once a day is a simple fix.
Certain vaccinations also offer indirect protection against eye infections. Vaccines for measles, rubella, chickenpox, and shingles guard against viral diseases that can cause conjunctivitis as a secondary symptom. Staying current on these routine immunizations removes several potential causes of eye infection entirely.