Four year old children were developing cataracts, basically going blind at four. The cause of the cataracts? They were watching food cook in microwaves, shoving their heads right up against the door and watching. In spite of the fact that there are screens built into the door to catch the microwaves, some escaped and caused the cataracts. Yes. I could believe that microwaves from cell phones cause tumors.
The screen in the door is not the place where microwaves are prone to leak out. It's the joint between the door and the body of the oven. I'd expect to see scalp and neck burns before any eye damage.