I've been diagnosed with this today and I'm scared. I was told during a routine eye exam at the optician said she needs to immediately refer me to hospital. For some reason the next thing I know I open my eyes and the room is full of people and paramedics and I had collapsed. I have never ever had this problem before. I have had a cat scan and nothing is showing such as a tumour but I have been told to go back in the morning at 8.30 for tests. Has anyone had this before ?