The five key signs of an eye injury are vision changes (blurriness, double vision, or floating spots), pain or burning, bleeding in or around the eye, an irregularly shaped or unequal pupil, and swelling or bruising around the eye socket. Some of these signs appear immediately, while others develop over hours. Because it’s hard to judge the severity of an eye injury just by how it looks or feels, any of these signs warrants prompt attention.
1. Vision Changes
Any disruption to your normal vision after a blow, scratch, or exposure to a substance is a red flag. This can show up in several ways: blurry or double vision, floating black spots, flashes of light, or a dark shadow creeping across part of your visual field. Brief blurriness that clears in seconds (from watery eyes or a minor irritant) is usually not alarming. But if the change lasts more than a few minutes, something inside the eye may be damaged.
Floating spots or flashes of light can signal that the retina, the light-sensitive layer at the back of your eye, is being pulled or torn. A shadow or curtain effect over part of your vision points to the same concern. These symptoms sometimes appear hours after the initial injury rather than right away, so it’s worth monitoring your vision closely even if everything seems fine at first.
2. Pain or Burning
A healthy eye doesn’t hurt. Sharp pain, a deep ache, or intense burning after any kind of trauma is your eye telling you something is wrong. The type of pain offers clues about the type of injury. A gritty, scratching sensation often points to a corneal abrasion (a scratch on the clear front surface). A deeper, throbbing pain can suggest damage further inside the eye or increased pressure within it. Burning and intense tearing are hallmarks of a chemical exposure.
Chemical burns deserve special mention because the type of chemical matters enormously. Alkaline substances (like oven cleaners, drain openers, or certain industrial solvents) penetrate eye tissue rapidly, dissolving through cell membranes and moving deeper over time. Acidic substances generally cause less internal damage because they create a barrier of hardened protein on contact that limits further penetration. The one major exception is hydrofluoric acid, which penetrates as aggressively as alkaline chemicals. If any chemical gets in your eye, flush it with clean water immediately and continuously for at least 15 to 20 minutes. Don’t rub the eye, and don’t put anything in it besides water or saline rinse.
3. Bleeding In or Around the Eye
Not all eye bleeding is the same, and the location tells you how serious it is. A bright red patch on the white of your eye, called a subconjunctival hemorrhage, is a broken blood vessel on the surface. It looks dramatic but is typically painless and heals on its own without affecting vision.
Blood that pools in the colored part of your eye (the iris area) is a different situation entirely. This is called a hyphema, and it means blood has collected in the front chamber of the eye. Hyphemas hurt, and they’re medical emergencies because they can raise pressure inside the eye and lead to permanent vision loss if untreated. The blood may appear as a visible layer or just a hazy reddish tint over your iris. If you see blood in the colored part of your eye after an injury, get emergency care.
4. An Irregular or Unequal Pupil
After a significant eye or head injury, check your pupils in a mirror. They should be round, roughly the same size, and both should shrink when you shine a light at them. A pupil that looks oddly shaped, noticeably larger or smaller than the other, or doesn’t react to light suggests internal structural damage. This could mean the iris has been torn, the lens has shifted, or there’s swelling affecting the nerves that control pupil size.
Unequal pupils after any blow to the eye or head are always worth immediate medical evaluation. This sign can indicate damage not just to the eye itself but potentially to the brain or the blood vessels supplying it.
5. Swelling, Bruising, or Deformity
Swelling and bruising around the eye are common after blunt trauma and aren’t always serious on their own. But certain patterns suggest a fracture of the bones surrounding the eye (the orbital bones). If the eye appears sunken compared to the other side, or if the cheekbone looks flattened, the floor or wall of the eye socket may be broken. The most telling sign of an orbital fracture is restricted eye movement. If you can’t look upward (or sometimes downward) with the injured eye, a piece of bone or muscle tissue may be trapped in the fracture. Children with this type of fracture can also experience nausea and a slowed heart rate from nerve irritation.
Even without a fracture, significant swelling can make it difficult to assess what’s happening underneath. If you can’t fully open the eye or the swelling is getting worse rather than better, have it evaluated.
What Not to Do
Your instincts after an eye injury can sometimes make things worse. Don’t rub the eye, even if it feels like something is in it. Rubbing can push a foreign object deeper or worsen a corneal scratch. If something is embedded in the eye, don’t try to pull it out. Don’t apply pressure to the eye, and don’t use eye drops unless emergency personnel instruct you to.
For chemical exposures, flush with water right away. For everything else, the safest approach is to loosely cover the eye (without pressing on it) and get professional evaluation. Between 10 and 20 percent of work-related eye injuries result in temporary or permanent vision loss, and many of those outcomes could improve with faster treatment. The eye is one area where playing it safe genuinely pays off.