Today I experienced for about five minutes a pulsating peripheral vision, the effect was as if an overhead fan was turning and pulsing the light. Primary vision was good; I could read with no problem. I m female, 64, 115 pounds, 5 6 . I was simply walking throuth the house when it happened. As I passed the telephone, a light appeared to be blinking. When I stopped and looked directly at it I could see that it was on steadily. That when I realized the problem. Any ideas?