If this were a dog we would say for sure it was a diabetic catarct, given its mature appearance and rapid onset. But in a rabbit things aren’t quite so simple; the animal has no other signs of diabetes and most importantly the other eye still has a clear lens! Not all diagnoses are as straight forward as we would like them to be! More importantly the animal is behaviourally unaffected and needs no treatment. It is always possible that Encephalitozoan cuniculi is involved in cataractogenesis here, but here the owner was not concerned enough to warrant serological confirmation of this.