I guess it was inevitable that I would turn into Mrs McGoo, because I was so reckless with my diabetes - which makes the tiny blood vessels at the back of your eye unstable and weak.
But, in many respects, I've only myself to blame. I used to keep my blood sugar deliberately high so that when I was working in the rehearsal room, say, on one of my plays, I didn't disturb anyone at quiet moments by unwrapping a Mars bar if I felt I was about to slip into a coma.
And I was always in a hurry, leaping on to trains as they moved out of the station, running, running everywhere, forever rushing around from one place to another, and that made it difficult to stick to the diabetic routine. But really I was cavalierly ignoring the fact that I had this disease.