One rule covers most eye trauma: protect without pressure. A rigid shield resting on the bone is safe; a pad taped over the eye can turn a survivable injury into a catastrophic one.
This is the one situation where you act before you travel. Flush the eye with clean water or saline continuously for at least 15–20 minutes, holding the lids open, before or while heading to emergency care. Alkalis (drain cleaner, cement, oven cleaner) are worse than acids and keep penetrating. Bring the product container or a photo of the label. Do not attempt to neutralize with another chemical.
Shield, do not pad. Get an examination the same day even if vision seems fine: bleeding inside the front of the eye (hyphema), a retinal tear, an orbital floor fracture and lens damage can all be present with a deceptively comfortable eye. Warning features that make it urgent are pain on eye movement, double vision, a shadow in the field, flashes and floaters, or numbness of the cheek.
Blink several times and let tears work. Irrigate with clean saline. If it does not clear, or if there is a gritty sensation that persists, get it looked at — a retained particle under the upper lid scratches the cornea with every blink, and metal on the cornea can leave a rust ring that needs removing. Never use tweezers on the eye itself.
Treat as an intraocular foreign body until proven otherwise, even if the eye looks and feels normal. A tiny metal fragment can penetrate with almost no symptoms. This needs imaging, not reassurance.
Painful, light sensitive, watery, with a strong feeling of something in the eye. Get it examined. Routine patching is not the modern treatment — evidence does not support it for simple abrasions and it may slow healing. Contact lens wearers with an abrasion need urgent review because of the risk of aggressive infection.
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If you have no shield, the classic improvisation still works: cut the bottom third off a disposable cup and tape it over the orbit so the rim rests on the bone above the brow and below on the cheek, with nothing touching the eye or lid. Tape the cup, not the lid. It is crude and it is correct — it prevents contact and applies no pressure.
Cover the other eye only if a clinician asks. Both eyes move together, so occluding the good eye reduces movement of the injured one, but it also leaves the person blind and frightened, and it is rarely necessary for a short journey to hospital.
Most serious eye injuries are preventable and happen in predictable places: DIY, grinding and hammering, sports with a ball or a racket, and garden tools. What genuinely works:
Related: post-surgery eye shields, when not to cover an eye, and managing light sensitivity during recovery.
Use a rigid shield that rests on the bone, never a pad taped over the eye. Pressure on a possibly ruptured globe can force out its contents. If you have no shield, tape the cut-down base of a disposable cup over the orbit.
Leave it in place, do not rub or rinse, protect the eye with a rigid shield that does not touch the object, and go to an emergency department immediately. Removing an embedded object can open the wound.
Yes. Irrigate immediately with clean water or saline for at least 15 to 20 minutes while heading for emergency care, and bring the product label. Alkalis keep penetrating and cause the worst damage.