This 10 year old cob was presented having failed a vetting because of this strange lesion, symmetrical in both eyes. The referring veterinary surgeons suspected previous uveitis. Would you pass the horse?
The simple answer is ‘yes’! The horse has a very unusual congenital malformation in development of the iris, leaving it with two pupils. The key difference from a uveitis case, as in this horse rightly failed at a vetting, is that the iris in the first horse is light brown and there are no signs of previous inflammation – the band of tissue is not a synechium which would appear much more irregular.