Eosinophilic keratitis has been described in horses, cats and rabbits. It can be a frustrating condition for owners, veterinarians and animals. In horses there is often a seasonal element to the condition, but the exact aetiopathogenesis has not yet been determined. Medical treatment is usually prolonged and surgical intervention may be appropriate in selected cases. This article aims to help veterinarians diagnose eosinophilic keratitis in horses and treat is effectively.