singapore rabbits

third eyelid prolapse, what it means

updated 19 May 2026

rabbit eye problems are stressful to spot in any setting, but in Singapore they carry extra weight. year-round heat and humidity, typically 28 to 32°C and 70 to 90% humidity, can accelerate eye inflammation and bacterial growth faster than temperate climates. most neighbourhood clinics don’t see exotic animals, so finding someone who actually treats rabbits often means crossing the island. if you notice a fleshy pink film or swelling in the inner corner of your rabbit’s eye, that is not a piece of hay or dust. that is the third eyelid, and when it prolapses it is telling you something is wrong.

what is the third eyelid

rabbits have three eyelids: an upper lid, a lower lid, and a nictitating membrane. the nictitating membrane sits tucked in the inner corner of each eye, beneath the other two lids. it sweeps across the eye surface to spread moisture and offers a layer of physical protection. most of the time you don’t see it at all.

when the membrane becomes visible, partially covers the eye, or looks swollen and pink or red, that is called third eyelid prolapse or nictitating membrane prolapse. in some animals, like dogs, this is commonly called “cherry eye” and specifically involves the gland inside the membrane. in rabbits the anatomy is slightly different, but the core issue is the same. the membrane is sitting where it should not be, or it has become inflamed enough to be visible when it normally would not.

why does it happen

third eyelid prolapse in rabbits is almost always a sign of something else going on. the causes fall into a few categories.

eye irritation or infection is one of the most common triggers. conjunctivitis, a bacterial infection of the eye lining, can cause enough swelling to push the membrane forward. dusty HDB corridors, poorly ventilated flat corners, and bedding particles can all introduce irritants that start this chain.

dental root problems are a surprisingly frequent cause. rabbit teeth roots sit very close to the tear duct and eye socket. an overgrown molar or infected tooth root can press on the orbit and displace the third eyelid. this is why vets often want to check the teeth even when you bring your rabbit in for an eye issue.

encephalitozoon cuniculi, commonly called E. cuniculi, is a parasitic infection affecting the nervous system, eyes, and kidneys. one of its classic presentations is a white or cloudy lens, but it can also cause inflammation that involves the third eyelid area. E. cuniculi is common in Singapore’s rabbit population.

systemic illness, including respiratory infection, Pasteurella (snuffles), or a retrobulbar abscess (an abscess forming behind the eyeball), can cause enough pressure or inflammation to make the membrane visible. in these cases the third eyelid is a secondary sign of a bigger problem.

trauma is less common but possible, especially if your rabbit grazed itself on a cage wire or was scratched by another animal. SG rabbit owners in multi-pet HDB flats should consider whether any recent contact around the face occurred.

what the symptoms look like

you might notice one or more of the following:

  • a pinkish or pale film partially covering one or both eyes, most visible in the inner corner
  • a small fleshy swelling that sits in the corner of the eye like a lump
  • excessive tearing or discharge, which may be clear, white, or yellow
  • the affected eye held partially closed, or your rabbit pawing at the face
  • redness or swelling around the eyelid margins
  • in more serious cases, cloudiness over the cornea or a visibly protruding eye

sometimes the third eyelid is only visible when the rabbit is unwell or relaxed, and retracts when they recover. if you notice it consistently, or paired with any of the signs above, act quickly.

how serious is it and when to see a vet

the short answer: see a vet the same day, or first thing the next morning if it is after hours. do not wait more than 24 to 48 hours for a new eye symptom in a rabbit. eyes inflame and deteriorate quickly, and rabbits hide pain well. by the time your rabbit is visibly distressed, the condition has often been building for some time.

treat the following as urgent and contact a SG exotic vet immediately if you see any of these alongside the third eyelid:

  • the eye is bulging outward
  • the cornea looks white, blue, or cloudy
  • your rabbit has stopped eating or producing droppings
  • the rabbit is tilting its head or has lost its balance, which may indicate E. cuniculi affecting the nervous system
  • there is thick yellow or green discharge from the eye or nose

after-hours exotic care in Singapore is limited. not every 24-hour clinic accepts rabbits. keep the contact details for a rabbit-capable after-hours clinic saved before you ever need it.

what to expect at the vet

a SG exotic vet examining a third eyelid prolapse will typically:

take a full history, asking about diet, housing, recent changes, and whether other symptoms appeared at the same time.

examine both eyes, even if only one looks affected. they will check the eye surface, interior, and surrounding socket area.

check the teeth, because dental disease is a frequent underlying cause. this may require brief sedation if the back molars cannot be visualised with the rabbit awake.

run diagnostics such as a Schirmer tear test to measure tear production, fluorescein staining to check for corneal ulcers, and possibly blood tests or serology for E. cuniculi antibodies.

recommend imaging in some cases. if a retrobulbar abscess or dental root problem is suspected, X-rays or a CT scan may follow. as of 2026, a rabbit eye consult at a SG exotic clinic typically ranges from SGD 80 to SGD 150 for the consultation alone, with diagnostics adding SGD 50 to SGD 400 or more depending on what is needed.

treatment depends entirely on the underlying cause. it might involve antibiotic eye drops, systemic antibiotics, anti-inflammatory medication, dental treatment, or in severe cases surgery. there is no single protocol because the visible membrane is a symptom, not the primary diagnosis.

what owners often get wrong

treating it as cosmetic. the third eyelid being visible is not just unusual looking. it signals an underlying problem that needs identifying. owners sometimes wait to see whether it resolves on its own. in Singapore’s heat and humidity, eye infections and dental disease move fast. waiting a week is too long.

using over-the-counter human eye drops. some owners try saline rinses or apply human eye drops they have at home. some human formulations contain ingredients that are harmful to rabbits, and most will mask symptoms without treating the actual cause. always let the vet prescribe whatever goes into your rabbit’s eye.

assuming it is always E. cuniculi. this parasite is common enough in Singapore that many rabbit owners have heard of it and jump to that conclusion. but third eyelid prolapse has multiple causes, and focusing on E. cuniculi without testing can mean the real issue, whether dental, bacterial, or trauma-related, goes untreated.

ignoring the rest of the rabbit. owners naturally focus on the affected eye. but weight loss, changes in droppings, head tilt, or signs in the other eye all matter. check the whole rabbit and report everything you have noticed to the vet, even if individual signs seem unrelated.

community-sourced information here is not veterinary advice. for any health concern see a licensed SG exotic vet.

community-sourced information, not veterinary advice. for medical issues, see a licensed SG exotic vet — start with our vet directory.

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