Not entirely blind - I still had peripheral vision. The problem was that right at the centre of my vision - the place you are looking in other words - I had no sight at all. So, when I got up and stood on the bathroom scales, what should have looked something like this
looked instead like this.
I then realised that I couldn't see whatever I looked at directly. I must say that I was impressed by the ability of my brain to guess as what should fill the blind spot; it seemed to work out from the colours immediately surrounding the blind spot what it should tell me I was seeing, which is how I had managed to get to the bathroom scales in the first place without realising my eyesight was deficient.
I mentioned this to the Dearly Beloved (aka She Who Must Be Obeyed). I probably shouldn't have sprung it on her because she went a bit pale.
"What are you going to do? How can you do photography, or play badminton or bridge? Or drive?"
I hadn't thought of that.
When she opened, we called our local optician. She asked me about the symptoms and then said "You probably have a migraine."
That was the good and bad news. The headache struck shortly after, with the violence of a tropical storm.
I spent the rest of the day in a darkened bedroom, groaning softly to myself. The following morning my head was better and so was my eyesight.
Lucky me. I can still take photographs and bridge and will be back to badminton and driving in the not too distant future. See, life's not so bad.