Eye injuries: what to do in the first minute, and what never to do

The eye is a small, exposed organ, yet the instinctive reaction to anything entering it is almost universal: rubbing. And that is precisely the movement that turns a light surface scratch into a deep corneal wound, and a grain of sand into a mark that lingers for weeks. The difficulty is that most eye injuries happen in entirely ordinary situations nobody prepares for: dust carried on the air on an open day, a splash of cleaning fluid while wiping down a kitchen, a metal splinter during a small repair at home, a ball or an elbow in a match between friends, or a branch while working in the garden. Nobody plans for those moments, so the response is wholly improvised — and knowing four or five simple rules in advance can be the difference between a full recovery in days and damage that stays. This article explains what to do in the first minute according to the type of injury, and the signs that mean a case is an emergency that cannot wait until morning.

The rules that apply before you even know the injury type

Before you work out what went into the eye or what struck it, a set of fixed responses applies to almost every case and prevents most of the additional damage. They share a single idea: the eye is largely capable of protecting and cleaning itself, and your job is to avoid obstructing it rather than to intervene forcefully. Tears themselves are an effective natural washing mechanism, and repeated blinking moves a foreign body towards the inner corner, where it often leaves on its own. The hand, meanwhile, is the worst available tool, because it carries contamination onto a surface that is already grazed and adds pressure to delicate tissue. Apply the following in every injury:

• Do not rub the eye at all, however irritating the sensation. Rubbing drags the foreign body across the corneal surface and turns passing discomfort into a real abrasion.
• Wash your hands before going anywhere near the eye. A grazed or irritated surface picks up contamination far more easily than an intact one.
• Remove contact lenses if you wear them — unless they are stuck after a chemical exposure, in which case start rinsing immediately and do not get delayed trying to take them out.
• Do not put in any drop, ointment or home remedy on your own initiative. Some drops mask the symptom and delay diagnosis, and some are unsuitable for an injured eye.
• Do not press on the eye or force it open if it is clamped shut in spasm; a light cover that does not touch the surface is enough.
• Cover the uninjured eye too when the injured one needs to stay still, because the eyes move together and immobilising one alone is not practically possible.

Dust and foreign bodies: the most common case

A grain of sand, an eyelash or airborne dust entering the eye is the commonest thing people face, and most of it resolves on its own within minutes if the eye is left to deal with it. The correct approach is to give tears a chance first through repeated blinking without rubbing; if the sensation persists, rinse the eye with clean water or sterile saline for several minutes while gently holding the lid open. Pulling the upper lid over the lower one is an old and useful trick, because the lower lashes sweep the inner surface of the upper lid, where particles often hide. What is not acceptable is trying to extract something with the corner of a tissue, a cotton bud or tweezers — these are not tools for a surface as sensitive as the cornea. And there is a fundamental distinction to watch for: a loose surface particle is one thing, an embedded object that does not move when you blink is something else entirely. Note these differences:

• A surface particle moves as you blink and the location of the sensation shifts; it usually responds to rinsing within minutes.
• An embedded object produces a sensation in one fixed spot that does not shift, and is never to be removed at home however small it looks.
• Metal fragments from cutting or grinding are a special case deserving assessment even if the discomfort passes, because some leave a residue that needs professional cleaning.
• A lingering scratchy feeling after the particle is gone is common and usually means the surface was abraded; it warrants assessment if it lasts more than a day.

Chemical exposure: the first minute is everything

This is the one situation where immediate action matters more than reaching a doctor, because damage accumulates with every second the substance stays on the surface. The rule is simple and absolute: rinse immediately with running lukewarm water for a long time before anything else — before looking up the name of the substance, before phoning anyone, before setting off. The usual recommended time is no less than fifteen to twenty continuous minutes, a duration that feels extremely long in the moment but is the single strongest predictor of the final outcome. Turn the head so the injured eye is lower, letting water run away from it rather than towards the other eye. Never try to neutralise one substance with another: acid is not treated with alkali or the reverse, and the reaction between them generates heat that adds to the damage. Strong household cleaners, oven products, batteries and building powders such as lime and cement are among the most dangerous to the eye, because they are alkaline and penetrate deeply faster than acids do. Keep this in mind:

• Start rinsing within seconds of exposure; the difference between rinsing immediately and rinsing two minutes later is a real difference in outcome.
• Keep rinsing after the burning subsides, because the absence of pain does not mean the substance has been fully removed.
• Hold the lids open with your fingers while rinsing, since the lid tends to clamp shut in spasm and traps the substance inside.
• Take the product container or a photo of its label with you when you go to be seen; knowing what it was shortens many steps in treatment.
• Get seen even if the eye feels completely better after rinsing, as some surface burns only reveal their true extent hours later.

Blunt impact and blows

A direct blow from a ball, an elbow, a door or a flying object is different from a foreign body, because the damage may be internal and invisible from outside. The visible result is usually swelling and bruising around the eye, and that on its own measures nothing: there may be a superficial bruise with no internal problem, or the outside may look minor while there is bleeding inside the front chamber or a retinal tear. The practical rule here is therefore external cooling without pressure, then monitoring vision itself rather than the appearance of the eye. Place a cold compress on the bony area around the eye, not on the eyeball, in short repeated spells over the first hours, and avoid aspirin and certain painkillers that increase bleeding tendency unless a professional has prescribed them. If the object was sharp, or there is an open wound or bleeding from the eye itself, then there is no rinsing, no pressure and no attempt at removal — cover with a rigid shield without touching and go immediately. Watch for these indicators after any blow:

• Any change in clarity of vision, however slight or intermittent, in the hours after the blow.
• Double vision or difficulty moving the eye in a particular direction, which may point to an injury in the surrounding bone.
• Red fluid or a visible level of blood inside the coloured part of the eye.
• A difference in pupil size, or one pupil losing its usual round shape.
• Pain that increases over time instead of settling, or marked light sensitivity appearing later.

When the case is an emergency that cannot wait

The commonest mistake after rubbing is delay: many people sleep on it hoping things will be better by morning, and certain conditions specifically lose their best window during those hours. A useful rule is to judge the situation by vision and pain rather than by how the eye looks from outside, since the most serious injuries are often less dramatic in appearance than an ugly superficial bruise. It is also worth knowing that some of these signs can appear with no injury at all, as a warning of a sudden internal problem, and they deserve exactly the same response. Go immediately in any of the following:

• A sudden drop in vision, or blur that was not there before the incident.
• An open wound in the eye or lid, or any fluid coming from the eyeball.
• An object embedded in the eye — cover it without any attempt to pull it out.
• A chemical exposure of any kind, even after complete rinsing and feeling better.
• Sudden flashes of light, a large increase in floaters, or a shadow creeping across one side of the visual field.
• Severe pain inside the eye together with nausea or halos around lights.

It remains true that the best first aid is the kind never needed. Most household and occupational injuries that reach clinics needed one pair of safety glasses that was not worn, and most sports injuries needed sports eyewear with lenses that do not shatter. Ordinary prescription or sunglasses are not protection: their edges are open at the sides and the material can break under a strong impact. Keep genuine eye protection in the toolbox or with the garden equipment, keep a small bottle of sterile saline at home and in the car, and know in advance where the nearest place offering emergency eye care is — so that you are not searching for it in a moment when there is no time to search.