To flush out your eye, tilt your head so the affected eye is facing down, then let clean, lukewarm water or sterile saline flow gently across the eye for at least 20 minutes. That duration matters more than most people expect, especially for chemical exposures. The goal is to wash away whatever is irritating the eye without rubbing or pressing on it.
Step-by-Step Eye Flushing at Home
Start by washing your hands. Then position yourself at a sink, in a shower, or over a basin. Tilt your head to the side so the affected eye is lower than the other one. This prevents contaminated water from flowing into your unaffected eye. Hold your eyelids open with your fingers, because your natural reflex will be to squeeze them shut.
Let a gentle, steady stream of lukewarm tap water or sterile saline flow across the surface of your eye. Move the stream across the entire eye, including under the upper and lower lids. Avoid pointing a strong stream directly at the center of your eye (the cornea), as this can cause discomfort or minor damage. Instead, let the water flow across the surface from the inner corner outward. Blink frequently during flushing to help dislodge particles. If you don’t have access to a sink, you can pour water from a clean cup or bottle, or submerge your face in a bowl of clean water and blink repeatedly.
How Long to Flush
For a small piece of dust or debris, flushing for a few minutes is usually enough. Once the particle washes out and the irritation fades, you can stop.
Chemical splashes require much more aggressive rinsing. The Mayo Clinic recommends flushing with clean, lukewarm water for at least 20 minutes after any chemical exposure. This applies to household cleaners, pool chemicals, solvents, and any unknown substance. Don’t wait for an ambulance or try to drive to a hospital first. Begin flushing immediately, wherever you are, with whatever clean water is available.
Alkali substances (like oven cleaners, drain openers, cement dust, and ammonia-based products) are especially dangerous because they dissolve into fatty tissue and penetrate deeper into the eye. Acids, by contrast, tend to cause proteins on the eye’s surface to clump together, which actually creates a partial barrier against further damage. This is why alkali burns are generally more severe and why thorough, prolonged flushing is critical for any chemical contact.
What Fluid to Use
In an emergency, clean tap water works and is widely available. Don’t delay flushing because you’re searching for something better. Speed matters far more than the type of fluid.
When you have the option, sterile saline eyewash (sold at pharmacies) is the ideal choice. It matches the salt concentration of your tears and causes less stinging. Cleveland Clinic advises against using homemade saline solutions in your eyes, even if you think they’re clean, because improperly prepared solutions can introduce bacteria and cause infection. Stick with store-bought sterile eyewash or plain tap water.
Avoid using milk, essential oils, or any other home remedy. These can introduce new irritants or bacteria into an already vulnerable eye.
If You’re Wearing Contact Lenses
Try to remove your contact lens before flushing if you can do so easily. If the lens is stuck, don’t force it. Start flushing over the lens. Let sterile saline or clean water flow over the eye for several seconds until you feel the lens loosen and begin to move. Once it’s no longer adhered to the surface, gently slide it out. Pulling a stuck lens off a dry or irritated eye can scratch the cornea.
When Not to Flush Your Eye
There is one important exception to the “flush immediately” rule. If you suspect a penetrating eye injury, where something has punctured the eyeball itself, do not flush, rinse, or touch the eye. Signs of a ruptured globe include a visible cut or hole in the eye, a misshapen pupil, fluid leaking from the eye, or a sudden dramatic loss of vision after impact from a sharp or high-speed object.
In this situation, gently place a rigid shield (like a paper cup or the bottom of a plastic bottle) over the eye socket without letting anything press against the eye itself. Avoid using soft pads or gauze that could contact the surface. Any pressure on a ruptured eye can worsen the injury. Get to an emergency room immediately.
Workplace Eyewash Stations
If you work around chemicals, your workplace should have an emergency eyewash station within 10 seconds of walking distance from the hazard. The ANSI standard for these stations calls for flushing fluid to be delivered at a low enough velocity that it won’t injure the eye, with enough volume to sustain flow for at least 15 minutes. The water temperature should be tepid, not hot or ice cold, to avoid causing additional damage or making it difficult to keep flushing for the full duration. Knowing where your nearest station is before an accident happens can save your vision.
Warning Signs After Flushing
For minor debris like an eyelash or dust particle, your eye may feel slightly irritated for an hour or two after flushing. That’s normal. Persistent symptoms are not.
Any chemical exposure to the eye warrants professional medical evaluation after you’ve finished flushing, even if the eye feels better. Chemical injuries can threaten your vision, and damage sometimes progresses over the hours following exposure. Get to an emergency room promptly after completing your initial 20-minute rinse.
For non-chemical irritants, watch for pain that doesn’t improve within a few hours, blurred or reduced vision, increased sensitivity to light, visible redness that worsens rather than fades, or a sensation that something is still in the eye despite thorough flushing. A foreign body can sometimes lodge under the upper eyelid where flushing alone won’t reach it, and a doctor may need to evert the lid to locate and remove it.