Eye & Vision Issues in Rabbits

Eye issues are an extremely common problem in pet rabbits, but they are very often a symptom of a problem elsewhere in the body. A weepy or runny eye in a rabbit is rarely just a simple eye infection; more often than not, it is a direct consequence of dental disease. Understanding this connection is one of the most critical aspects of rabbit healthcare.

The #1 Cause of Weepy Eyes: Dental Disease

A rabbit's teeth grow continuously throughout its life. The roots of the upper incisors and cheek teeth extend deep into the skull, right next to the nasolacrimal duct—the tear duct. This duct is a tiny tube that drains tears from the eye out through the nose.

• The Mechanism: When a rabbit's diet is low in hay, the teeth are not worn down properly. The roots of the upper teeth begin to elongate and grow in the wrong direction. These overgrown roots press on, inflame, and eventually block the delicate tear duct.
• The Result (Epiphora): With the duct blocked, the tears have nowhere to drain. They spill over the lower eyelid, causing the fur to become wet. This condition is called epiphora.
• Progression (Dacryocystitis): The stagnant, trapped tears within the blocked duct are a perfect breeding ground for bacteria. This leads to a painful infection and inflammation of the tear duct, known as dacryocystitis. The discharge will change from clear tears to a thick, white, pus-like substance.
• Action: A weepy eye in a rabbit warrants an immediate and thorough veterinary examination of the mouth and teeth. Skull x-rays are essential to visualize the tooth roots and their impact on the tear ducts. While antibiotic eye drops may be prescribed, the problem will not resolve until the underlying dental disease is addressed. This may require tooth trimming or, in severe cases, extraction.

Other Common Eye Problems

1. Corneal Ulcers:

   • Cause: A scratch on the surface of the eye (cornea) is very common. It is most often caused by a poke from a sharp piece of hay.
   • Signs: The rabbit will be in extreme pain, holding the eye completely shut. The eye will be tearing profusely.
   • Action: This is an emergency. An untreated ulcer can lead to the loss of the eye. A vet will diagnose the ulcer with a special stain and prescribe antibiotic eye drops and pain medication.

2. Conjunctivitis:

   • Cause: An inflammation of the pink tissues around the eye. It can be caused by environmental irritants (dust, ammonia) or a bacterial infection, often secondary to a blocked tear duct.
   • Signs: Redness and swelling of the conjunctiva, with a clear or milky discharge.

3. Abscesses:

   • Cause: An abscess (a pocket of thick pus) can form behind the eye, often originating from an infected tooth root.
   • Signs: The eye will appear to bulge outwards. This is a very serious and painful condition.
   • Action: This requires aggressive veterinary treatment, including surgery to drain the abscess and often remove the affected tooth.

4. Cataracts:

   • Cause: A clouding of the lens. This can be an age-related change in senior rabbits or can be caused by the parasite E. cuniculi in younger rabbits.
   • Action: Rabbits adapt well to blindness. The main importance of a cataract diagnosis is to consider testing and treating for E. cuniculi if it is suspected.

Because of the intricate connection between a rabbit's eyes and teeth, any eye problem—especially a weepy one—should be considered a serious warning sign that requires a comprehensive veterinary workup.