This week the farm vet had to perform a surgery in order to remove cancerous growths around the eye of a cow. Unfortunately, he had removed one of this cow's eyes several years ago and the other eye now has a tumor. This is a procedure the farm vet will carry out as they arise every once and a while on farms. He uses a sedative and then a local anaesthetic to numb the area that will be worked on. The whole eye was removed last time due to a particularly aggressive "cancer-eye".
In this particular case we were able to save the remaining eye by surgically removing the growths and "freezing" the cancerous area with liquid nitrogen so the cow could keep her eye and vision!