Hi, I often see patterns of quite bright light that stops me from working, generally around the edges of my vision, it can affect one or both eyes, and can last 30 mins or a day. It may be quite intense or just enough to annoy you. I am on Blood pressure tables. Have been to see optometrist and he said to stop bothering him. What should i do? It may only happen once a month or 3 times a week, totall random