glaucoma in rabbits, signs and treatment

updated 19 May 2026 by xavier fok

rabbit owners in Singapore often don’t realise how quickly an eye problem can become serious. in a country where exotic vets are far outnumbered by cat-and-dog clinics, conditions like glaucoma tend to get misread as conjunctivitis or dismissed as mild irritation. add in our year-round heat and humidity, plus the dusty, enclosed spaces of most HDB flats, and you have a setting where eye health can deteriorate quietly before anyone notices. glaucoma is not a wait-and-see condition. understanding what it is, what it looks like, and how it gets treated is one of the most practical things you can do as a Singapore rabbit owner.

what is glaucoma in rabbits

glaucoma happens when fluid inside the eye, called aqueous humor, cannot drain properly. this causes intraocular pressure (IOP) to rise. when IOP stays elevated for too long, it damages the optic nerve and the retina. the result is permanent vision loss. in advanced cases, the eye itself becomes enlarged and the condition causes significant ongoing pain.

in rabbits, glaucoma is classified as either primary or secondary. primary glaucoma is genetic in origin. New Zealand White rabbits are the most studied breed for hereditary glaucoma, though mixed-breed rabbits can develop it too. secondary glaucoma develops because of another underlying condition. common triggers include uveitis (inflammation inside the eye), lens luxation, and cataracts that have gone untreated.

secondary glaucoma is more likely in Singapore’s pet rabbit population. E. cuniculi, a common parasitic infection in local rabbits, can cause uveitis that then leads to pressure buildup. dental disease that spreads infection near the eye socket is another route. if your rabbit has had any diagnosed eye inflammation in the past, periodic IOP monitoring with an exotic vet is worth discussing.

early signs to watch for

rabbits are prey animals. they instinctively hide signs of illness and discomfort. by the time something is visually obvious, the problem may already be weeks or months old.

signs that should prompt a vet visit include:

one or both eyes appearing larger than usual, or sitting slightly forward
a bluish, milky, or grey haze over the cornea (the clear surface of the eye)
redness in the white part of the eye
visible squinting or a half-closed eye that persists beyond a day
discharge or dried crustiness in the inner corner of the eye
apparent sensitivity to light, shown by your rabbit avoiding bright parts of the room
subtle behavior changes: less activity, reduced appetite, slight head positioning toward one side

as pressure continues to rise untreated, the eyeball may enlarge significantly. this is called buphthalmos. the eye protrudes beyond the normal lid margin and looks visibly swollen. this is not cosmetic. it is a sign of sustained, serious pain.

do not wait for a scheduled wellness appointment if you see any of these signs. contact a SG exotic vet promptly.

why Singapore’s climate and environment matter

Singapore’s climate sits at roughly 28 to 32°C and 70 to 90% relative humidity throughout the year. this environment puts chronic stress on rabbits, who are naturally adapted to cooler, drier conditions. heat stress depresses immune function over time. a rabbit with a weakened immune system is more susceptible to infections that can spread to and around the eye, increasing the risk of uveitis and secondary glaucoma.

indoor living in a HDB flat introduces its own pressures. many rabbits live in smaller enclosures with limited airflow unless AC is running consistently. dust, shed fur, and airborne particles build up faster in enclosed spaces and can cause repeated low-grade eye irritation. if your rabbit’s pen is positioned near a window that gets direct afternoon sun, prolonged glare and warmth in that area can compound the problem.

there’s also a practical access issue. exotic vets who are equipped to diagnose and manage rabbit eye conditions are concentrated in certain parts of Singapore. they are not evenly distributed the way general clinics are. if you live in the west or north of Singapore, your nearest suitable vet may be 30 to 45 minutes away, and after-hours access for emergencies is limited. knowing in advance which clinics see rabbits, and which have ophthalmic equipment, saves critical time.

how vets diagnose glaucoma

accurate diagnosis requires measuring IOP using a device called a tonometer. a small probe lightly contacts the cornea surface after a numbing drop is applied. the process is quick and most rabbits tolerate it without sedation.

normal IOP in rabbits generally falls between 15 and 23 mmHg, though values vary slightly by individual and source. your vet will usually take several readings and compare both eyes. a consistently elevated reading in one eye, even if the other is normal, is a concern.

beyond IOP measurement, your vet may also conduct:

a slit-lamp exam to check for lens abnormalities, inflammation, or corneal cloudiness
fundoscopy to examine the optic nerve and retinal health
bloodwork to test for E. cuniculi antibodies if that infection is suspected

as of 2026, a full exotic eye workup in Singapore typically costs SGD 150 to 350 depending on the clinic and the tests required. if your rabbit needs referral to a veterinary ophthalmologist, or if imaging is necessary, costs will be higher. ask your vet for a breakdown before proceeding so you can plan accordingly.

treatment options

treatment depends on the type of glaucoma, how far it has progressed, and whether the affected eye retains any functional vision.

medical management is the starting point for most early to moderate cases. your vet may prescribe topical eye drops that reduce fluid production or improve drainage. these are typically applied once or twice daily. consistency matters enormously. skipping doses allows IOP to spike, and each spike causes further irreversible nerve damage.

treating the underlying cause is critical for secondary glaucoma. if uveitis from E. cuniculi is driving the pressure buildup, your vet will likely combine IOP-lowering drops with anti-inflammatory medication and treatment targeting the parasite itself. stabilising the root cause gives the eye a much better chance of long-term management.

surgical options exist but are used less frequently in rabbits than in dogs. rabbit eye anatomy makes surgery more complex. access to veterinary ophthalmologists in Singapore is limited, and surgery carries anaesthetic risk that must be weighed carefully for rabbits.

enucleation, or surgical removal of the eye, sounds like an extreme outcome. in practice, it is often the most humane option when a eye is permanently blind and still causing your rabbit chronic pain. rabbits adapt quickly to monocular vision. owners consistently report that their rabbits show improved energy, appetite, and demeanour after a painful eye is removed. it is a quality-of-life decision, not a defeat.

ask your vet to walk you through each option clearly. do not hesitate to ask for explanations in plain English if any medical terms are unclear.

what owners often get wrong

applying leftover eye drops without a diagnosis. it is tempting to try drops from a previous eye infection when you see cloudiness or redness again. glaucoma requires very different treatment from conjunctivitis. using the wrong drops can mask symptoms and delay proper diagnosis.

going to a general clinic first. most general veterinary clinics in Singapore are not equipped to measure IOP in rabbits. tonometers calibrated for small mammals are specialist tools. a general vet may reassure you that the eye looks fine when actual pressure is dangerously elevated. book directly with an exotic vet for any eye concern.

assuming the rabbit is fine because it’s still eating. rabbits in significant pain often continue to eat, move, and groom. this stoicism is a survival mechanism. normal behavior is not a reliable signal that your rabbit is comfortable. elevated IOP is painful whether or not your rabbit shows it.

stopping medication once the eye looks better. owners sometimes reduce or stop eye drops when redness clears and the eye appears calmer. IOP-lowering drops require long-term, consistent use to maintain safe pressure levels. stopping without vet guidance causes pressure to rebound, often reaching higher than the original level.

rabbit eye problems: a general guide, covering conjunctivitis, weepy eyes, and when each needs vet attention
E. cuniculi in rabbits, how this common parasite causes neurological and eye damage in Singapore rabbits
finding an exotic vet in Singapore, what to look for, what questions to ask, and what to expect on cost
our vet directory, exotic vets who see rabbits across Singapore, filterable by location

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