Pink eye makes the white of your eye turn noticeably red or pink, often with discharge that can range from watery to thick and crusty. The redness happens when tiny blood vessels in the clear membrane covering your eye (the conjunctiva) become inflamed and swollen, making them far more visible than usual. But the exact look of pink eye varies quite a bit depending on the cause, and those visual differences can help you figure out what type you’re dealing with.
The Core Signs Across All Types
Regardless of the cause, pink eye shares a few hallmark features. The most obvious is redness or a pinkish tint across part or all of the white of the eye. You’ll also typically notice increased tearing, some degree of discharge, and a gritty or irritated feeling. Many people wake up with their eyelids stuck together from dried discharge that crusted overnight.
Pink eye can show up in just one eye or both. Viral and bacterial forms often start in one eye and spread to the other within a day or two. Allergic pink eye almost always affects both eyes at the same time, which is one of the easiest ways to tell it apart from an infection.
What Bacterial Pink Eye Looks Like
Bacterial pink eye produces a yellow or green sticky discharge that keeps coming throughout the day. This is the messiest form. You’ll notice globs of thick, colored discharge collecting in the corner of the eye or along the lash line, and your eyelids may feel glued shut when you wake up. The redness tends to be pronounced, and the eye can look swollen and irritated. It can appear in one eye or both, and it often feels like something is stuck in your eye.
What Viral Pink Eye Looks Like
Viral pink eye looks different in a few key ways. The discharge is mostly watery rather than thick, making the eye appear glassy and teary during the day. You may still get some sticky, crusty buildup overnight, but it won’t have the heavy yellow or green color of a bacterial infection. The redness can be just as intense, though, and the eye often looks bloodshot and puffy. Viral pink eye frequently starts in one eye and spreads to the second eye within days. The contagious period typically lasts 10 to 14 days from the onset of symptoms.
What Allergic Pink Eye Looks Like
Allergic pink eye has its own distinct appearance. Both eyes turn red and watery at the same time, and intense itching is the defining symptom. The conjunctiva can swell with fluid, giving the surface of the eye a puffy, almost jelly-like appearance. In some cases, the eyelids swell noticeably too. The whole eye can take on a milky or washed-out look because the swelling obscures the small blood vessels underneath.
If you wear contact lenses, a related form called giant papillary conjunctivitis can develop. This causes raised bumps on the underside of the upper eyelid that look like cobblestones when a doctor flips the lid. You’d notice it as increased irritation, a ropy or stringy mucus discharge, and a feeling that your contacts don’t sit right anymore. In severe cases, the bumps can grow large enough to make the upper eyelid droop slightly.
How It Looks in Newborns
Pink eye in newborns looks somewhat different from the adult version and requires prompt attention. Babies develop puffy, red, tender eyelids with drainage that can appear within days to several weeks after birth, depending on the cause. A bacterial infection from gonorrhea typically shows up within the first 2 to 5 days of life and produces thick pus along with significant eyelid swelling. Chlamydial conjunctivitis appears a bit later, usually 5 to 12 days after birth, with red eyes, swollen lids, and pus discharge. Some newborns develop mild redness and slight swelling from the antibiotic eye drops given at birth, which is a chemical reaction that resolves on its own.
How Symptoms Progress Over Time
Pink eye generally follows a predictable arc. Redness and discharge worsen over the first few days, peak, then gradually improve. Most cases clear up within a few days to two weeks. Viral pink eye tends to be the slowest to resolve since antibiotics don’t help it, and the redness and watering can linger for the full two weeks. Bacterial pink eye often improves faster, especially with antibiotic drops, though it can also resolve without treatment. Allergic pink eye persists as long as you’re exposed to the trigger, whether that’s pollen, pet dander, or dust mites.
When Redness Signals Something More Serious
A few visual signs suggest the problem isn’t simple pink eye. If you notice blurry vision that doesn’t clear when you blink away discharge, significant eye pain (not just irritation), extreme sensitivity to light, or halos and rainbows around lights, the cause may be something that needs urgent treatment.
- Corneal ulcer (keratitis): The eye looks red and watery with discharge similar to pink eye, but you’ll feel sharp pain and a persistent sensation that something is in your eye. The cornea itself may appear hazy.
- Uveitis: Redness with deep, aching pain, light sensitivity, blurry vision, and dark floating spots. This inflammation affects the inside of the eye and can look like pink eye on the surface.
- Angle closure glaucoma: A red eye with severe pain, blurry vision, nausea, headache, and halos around lights. This can be mistaken for pink eye in its earliest stages but is a medical emergency that can damage vision permanently.
The key distinction: simple pink eye is uncomfortable and annoying, but it doesn’t cause real pain or change your actual vision. If either of those is happening, the red eye likely has a different, more serious cause.