Cockatiel Squinting or Keeping One Eye Closed: Causes & Urgency

A cockatiel may squint or keep one eye closed because the eye is irritated, painful, or inflamed. Common causes include dust, dander, seed hulls, grooming debris, or a small foreign body trapped under the eyelid. Minor trauma is also common. A bird may bump into cage bars, get poked by a toy, or scratch the eye while rubbing its face. Even a small corneal scratch can make a bird hold the eye shut.

Infections are another important possibility. Birds can develop conjunctivitis, which is inflammation of the tissues around the eye. According to the Merck Veterinary Manual, conjunctivitis in pet birds may be caused by bacteria and can also be linked to a more widespread respiratory infection. That matters because eye signs sometimes happen along with sneezing, nasal discharge, or sinus disease rather than as a problem limited to the eye.

Less common but more serious causes include uveitis, deeper infection, sinus disease pressing around the eye, nutritional problems, or masses behind the eye. Vitamin A deficiency is classically associated with eye and upper airway problems in birds fed poor-quality seed-heavy diets. If the eye looks cloudy, swollen, or sunken, or if your cockatiel seems weak or fluffed up, your vet will want to rule out more than surface irritation.

One eye being affected can point toward local irritation or trauma, but it does not guarantee a minor problem. Birds often hide illness well, so a cockatiel that is quiet, sleeping more, eating less, or losing weight along with eye squinting needs prompt veterinary attention.

See your vet immediately if the eye is bleeding, looks cloudy or blue-white, appears swollen shut, has yellow or green discharge, or your cockatiel had known trauma. Urgent care is also important if your bird is rubbing the eye repeatedly, cannot open it at all, seems painful, is breathing harder, has nasal discharge, or is sitting fluffed and inactive. Eye disease in birds can progress quickly, and deeper problems are not always obvious from the outside.

A short period of careful monitoring at home may be reasonable only if the squinting started very recently, your cockatiel is otherwise bright and eating normally, and you suspect a mild irritant like dust after bathing or cage cleaning. Even then, improvement should be quick. If the eye is still partly closed after a few hours, or if any redness, swelling, discharge, or repeated blinking develops, contact your vet the same day.

Because birds are prey species, they often mask pain until they are quite uncomfortable. Merck advises veterinary attention for swelling, redness, discharge, excessive blinking, or holding the eye closed. In practical terms, that means most cockatiels with one eye shut should be seen sooner rather than later.

If you are unsure, err on the side of a prompt exam. A simple irritation may need only limited treatment, while a corneal ulcer, infection, or sinus problem can become much harder to manage if care is delayed.

Your vet will start with a full history and physical exam, not just a quick look at the eye. They may ask when the squinting started, whether there was any trauma, what your cockatiel eats, whether there are respiratory signs, and if there have been recent changes in the cage, toys, cleaners, or air quality. In birds, eye problems can be tied to sinus disease, infection, nutrition, or whole-body illness.

The eye exam may include checking the eyelids, conjunctiva, cornea, pupil, and the tissues around the eye. Your vet may use fluorescein stain to look for a corneal scratch or ulcer and may gently evert the eyelids to search for trapped debris. In some cases, they may collect samples for cytology or culture, flush the tear duct area, or recommend imaging if they suspect deeper sinus or orbital disease.

Treatment depends on the cause. Options may include carefully selected ophthalmic medication, pain control, supportive care, nutritional correction, or treatment for respiratory or sinus disease if that is the underlying issue. If your cockatiel is very stressed or painful, mild sedation may be needed for a safe and complete exam.

If your vet finds a deeper eye problem, severe ulcer, marked swelling, or signs of systemic illness, they may recommend more advanced diagnostics, hospitalization, or referral to an avian-focused veterinarian. Early treatment often improves comfort faster and may reduce the risk of lasting eye damage.

Home care should focus on comfort and preventing more irritation while you arrange veterinary advice. Keep your cockatiel in a warm, calm, low-stress area. Reduce dust by changing cage paper gently, avoiding aerosols and scented cleaners, and removing anything that may have poked or scraped the eye. If your bird is rubbing the face on perches or toys, simplify the cage setup until your vet has examined the eye.

Do not try to pry the eyelids open, remove a suspected foreign body with tweezers, or use human eye drops. Avoid leftover antibiotic ointments unless your vet specifically approves them. Some eye medications are not appropriate if the cornea is damaged, and birds can worsen quickly if the wrong product is used.

Support normal eating and hydration. Offer familiar foods, keep water easy to reach, and monitor droppings, activity, and appetite closely. If your cockatiel is fluffed up, eating less, breathing differently, or keeping the eye shut despite a quiet environment, move up the urgency and contact your vet right away.

If your vet prescribes eye medication, give it exactly as directed and complete the full course unless your vet changes the plan. Recheck visits matter. A bird may look a little better before the eye has fully healed, and your vet may want to confirm that the cornea and surrounding tissues are recovering normally.