As I think about it, the problem was after I went off my no carb diet and ate regular food for a few days. I had a glass of milk and (Shame on me!) a piece of cake today to celebrate Fathers Day with my husband and about half an hour later we were in our garden and I noticed the dimming in my right eye.
I was facing the west but it was overcast.
The time before when the dimming occurred, I think I had been outside in the heat and sunlight.
Oh yeah, this did occur after I went on this new medication.