Bird Eye Discharge Compared, and the Sinus Behind It

Quick answer

In birds, a weeping or discharging eye is usually not an eye disease. The infraorbital sinus wraps around and beneath the eye and connects to the nostrils, so most eye discharge in a bird is the visible end of a respiratory or whole-body problem.

That changes what you should be comparing. The colour of the discharge is worth noting, but it is a weaker clue than four other things: whether one eye or both are affected, whether the nostrils are involved, whether there is swelling, and whether the bird's weight and behaviour have changed.

Compare the two sides in good natural light. Symmetry tells you more than colour does.

• Both eyes affected points toward infection, irritation, or diet. One eye affected points toward trauma, a foreign body, or blocked drainage on that side.
• Any discharge with nostril crusting, sneezing, or a voice change is a respiratory problem and needs a vet, not an eye wash.
• Swelling beside or below the eye is sinus disease, not conjunctivitis.
• Some causes of eye and nasal discharge in birds can pass to people. Wash your hands, ventilate the room, and mention any human cough or fever when you call.
• Birds do not get tear staining, so there is no cosmetic version of a wet eye to manage at home.
• A cloudy surface, blood in the eye, a change in the shape of the eyeball, or any contact with a cat is not a discharge problem at all. It is an emergency.
• Never put human eye drops, redness relievers, or contact lens solution in a bird's eye.

:::danger
If a cat, dog, or rat has touched your bird, go to a vet immediately, whether or not you can see an injury.

Bacteria carried in the mouth and on the claws of these animals, including Pasteurella species, are frequently fatal to birds within a day or two. A puncture near the eye can be invisible under feathers, and the bird usually looks entirely normal for the first several hours. Survival depends on veterinary antibiotics started fast rather than on how the eye looks. Do not wait to see whether the discharge settles.
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Decide in 60 seconds

Why bird eyes weep for non-eye reasons

Picture the anatomy. The eye is very large for the size of the head. Directly around and beneath it lies the infraorbital sinus, a wide air chamber that connects forward to the nostrils and backward into air spaces within the skull. There is no thick wall between the sinus and the eye socket.

Tear fluid produced at the eye drains through a duct running toward the nasal cavity. That is the plumbing, and it explains almost everything on this page.

If the sinus fills with mucus or pus, three things happen at once. The drainage route for tears is blocked, so the eye overflows and the feathers below it become wet and stained. The swollen sinus presses on the eye from below and behind, so the lid closes partly and a bulge appears on the face. And infected material can track into the eye itself.

This is why owners so often report an eye infection in a bird that actually has sinusitis, and why weeks of eye drops make no difference.

Diet feeds into the same picture. A bird kept for years on seed alone becomes deficient in vitamin A, which the body needs to maintain the moist lining of the eye, sinus, and airway. That lining thickens and stops clearing debris properly, so infections take hold easily and keep coming back. This is one of the most common background causes of recurring eye discharge in pet birds and it is fixable, though not quickly.

Air quality is the third strand. The avian respiratory tract is extremely efficient at extracting things from air, including irritants. Cigarette and vape smoke, aerosols, scented candles, plug-in fresheners, cleaning sprays, dusty substrate, and poorly ventilated overcrowded cages all produce chronic eye and sinus irritation.

Why there is no such thing as tear staining in a bird

The rust-coloured streaks that run down the face of a white dog, a rabbit, or a rat come from porphyrin pigments in mammalian tears sitting on pale fur, usually with an overflowing tear duct behind them. No pet bird has that arrangement.

That matters because it removes the reassuring explanation. In a mammal, a wet face is often just plumbing. In a bird, a persistently wet, crusted, or stained eye is sinus disease, infection, irritation, injury, or a nutritional deficiency, and a few of those need to be seen today.

So a bird described as having tear stains is either a bird with genuine discharge or a bird with facial soiling from food and regurgitation. Both need explaining rather than cleaning.

Two normal things that get mistaken for disease

The third eyelid.

Birds close the eye mainly with the lower lid, and they sweep a pale translucent third eyelid, the nictitating membrane, sideways across the surface many times a minute. Caught in a photograph it looks exactly like a cloudy eye. Watch for a few seconds instead: a membrane that crosses and vanishes is normal, and cloudiness that stays put is not.

Pupil pinning.

The muscle controlling a bird's iris is skeletal muscle under voluntary control, so parrots deliberately flash their pupils narrow and wide when excited, interested, or talking. In a dog that pattern would be alarming. In a parrot it is a mood, and often a warning that the bird is over-stimulated, not a symptom.

What healthy eyes look like

Both eyes wide open, the same shape as each other, and the same size.

The surface is clear and glossy with no haze, no dull patch, and no visible film that stays.

The feathers immediately around the eye lie flat, dry, and clean, with no matting and no discoloured tide mark below the eye.

The skin around the eye, where it is bare in your species, is even in colour with no puffiness and no scaling.

The nostrils are open, clean, and the same size as each other, with no crust and no staining on the feathers above the cere.

Blinking is regular but not constant. A pale translucent membrane sweeping sideways across the eye is the third eyelid doing its job and is normal.

A gram scale and a written record beat any colour chart. Weight change tells you whether an eye sign is local or systemic.

The comparison table

Use the whole row, not the colour column alone. Colour narrows the possibilities; the accompanying signs decide the urgency.

The look-alikes worth separating

Sinusitis.

The most common answer. Discharge from one or both eyes, wet or stained feathers below the eye, blocked or crusted nostrils, sneezing, and often facial swelling. The eye is a symptom.

Vitamin A deficiency.

A long-term seed-fed bird with recurring eye and sinus problems that improve on treatment and then return. Often accompanied by poor feather quality and a history of repeated infections. Correcting the diet is slow but it is the actual fix.

Chlamydiosis.

An infection that produces eye and nasal discharge, green droppings, weight loss, and lethargy, and that can be passed to people. It is a reason to get a diagnosis instead of guessing, and a reason to tell your own doctor if anyone in the house develops a cough or fever after the bird became unwell.

Conjunctival irritation from air quality.

Both eyes, watery, in a bird that is otherwise completely well, in a household with smoking, vaping, aerosols, scented products, a dusty substrate, or a poorly ventilated room. Improves within days when the source is removed.

Trauma or a foreign body.

One eye, sudden onset, often with the eye held closed and the bird rubbing. Look for a known event. Treat as urgent because the surface can ulcerate fast, and because rubbing turns a surface scratch into a deep ulcer within hours.

A seed husk, a rope fibre, or a fragment of bedding can lodge under the third eyelid, where you cannot see it and must not go looking. The membrane is delicate and the surface beneath it scratches easily, so retrieval is a job for a vet with magnification and a stain that shows up damage the naked eye cannot.

Corneal ulceration.

A painful eye held closed or half closed, sometimes with a dull or hazy patch on the surface and increased blinking. It is the reason a squinting bird is a same-day case rather than a wait-and-see one, and the reason no steroid-containing product should ever be put in a bird's eye by an owner.

Cataract and age-related sight loss.

Cloudiness deeper in the eye rather than on the surface, in an older bird that has started misjudging perches, hesitating before flying, or feeling for a perch with its beak. Birds adapt to slow vision loss so well that owners often notice only when the furniture moves. It still needs examining, because a cloudy eye can equally be an ulcer or inflammation inside the eye, and those are painful and treatable.

Blocked tear drainage.

One eye that constantly overflows with clear fluid but is not painful or inflamed. Needs a vet to determine whether the duct is obstructed and why.

Mite infestation.

In budgies particularly, a burrowing mite causes crusty scaling at the corners of the beak, on the cere, around the eyes, and on the legs. Distinctive appearance and treatable.

Pox-type viral disease.

Raised crusted lesions on the eyelids and other unfeathered skin, seen in canaries, finches, and poultry. Highly relevant to anyone keeping birds outdoors, since biting insects spread it.

What you are comparing against: clear, glossy, fully open, with dry clean feathers all around and no tide mark below.

The routine that catches this early

What never to do

Never put human eye drops, redness relievers, contact lens solution, or antiseptic in a bird's eye. Redness relievers hide the sign the vet needs, and any product containing a steroid can turn a surface ulcer into a perforation.

Never use leftover medication from another bird or another species.

Never treat facial swelling with an eye product. The problem is behind the eye.

Never pick or soak crusts off the lids or the nostrils. The skin comes with them.

Never use cotton wool near a bird's eye. Loose fibres lodge under the third eyelid and become the next problem.

Never try to remove a foreign body yourself, and never lift, hold, or wipe under the third eyelid.

Never pluck the feathers around a swollen eye to see better.

Never put anything oily near the eye. Oil spreads through feathers, wrecks their structure, and destroys the insulation the bird depends on.

Never clean all the discharge away just before the appointment. Photograph the eye, then leave the material in place unless it has glued the lid shut, because its colour, volume, and location are part of the diagnosis.

Never restrain a bird tightly to examine its face. Birds have no diaphragm and breathe by moving the sternum, so a hand closed around the body suffocates them.

Never use gum colour, tongue colour, or capillary refill to judge how ill a bird is. Those are canine and feline checks and birds have no gums.

Never add over-the-counter cage bird tonics, antibiotic-branded seed additives, or water-soluble medications without a diagnosis. Under-dosing an infection through drinking water is a well-known way to produce a resistant, chronic case.

Never leave several affected birds together and hope it passes.

Never continue smoking or spraying in the room while waiting for the appointment.

When to get help

Go the same day for thick, coloured, or foamy discharge, an eye held closed, facial swelling, crusted or blocked nostrils, blood-tinged discharge, weight loss, or discharge in more than one bird at once.

Go immediately if the bird is also bobbing its tail, breathing with an open beak, or sitting on the cage floor, if there is blood in or around the eye, if the eyeball has changed shape or position, if the bird has suddenly stopped seeing, or if a cat, dog, or rat has touched it at any point.

Book this week for mild watery discharge in a bright, stable bird, for scaling around the eyes and cere, and for any recurring problem that has been treated before and come back.

Bring the weight record, dated photographs of the eyes and nostrils together, the full diet including treats, a list of anything smoked, sprayed, burned, or cleaned with in the home, the substrate used, how many birds share the airspace, and any recent additions to the household.

Clear eyes, open clean nostrils, a steady weight and a normal voice. That combination is what tells you the sinus behind the eye is healthy too.