Add my thoughts for what they're worth.
I've done the same as Mike H and had exactly the same result, one of the reasons I had to go to vari-focals when driving was that I couldn't focus quickly enough and clearly on the instuments, in my opinion I was more of a hazard with single vision because my eyes were away from the road for longer than they are now purely to give them time to focus. I have no problems with peripheral vision, at least certainly no more than I did beforehand.
However, there's always a however, I can see HJ's original point about closing speed judgement and motor sport, if I was driving at those sorts of speed that close I might well have problems as demonstrated by my experience playing cricket. When I first moved to vari-focals I tried batting in them, big mistake, I got my son to bowl at me in the nets, he's a big strapping fast bowler. At any speed above about 55mph the ball started to become a blur, at 65+mph it became a red streak, not a comfortable experience on a short pitched delivery I can assure you. Promptly went back to optician and got a pair of single vision distance glasses just for cricket and can now see the ball pretty well at 65+mph, still can't hit it but that's a different issue!! So I can see HJ's point about closing speeds but I hope I'm never in the position on the road where something is closing on me at that speed from 20 yards and is as small as a cricket ball. Strange thing is that varifocals made no difference, to me, at least, when playing badminton.
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I have to say I've never had any problem with judging speeds, it's all the same to me whether I'm using single vision or varifocals - and that includes some german autobahn driving where speeds are often higher.
I don't play cricket, but I've definitely had problems with badminton, just can't seem to judge the speed of the shuttle which means that I often totally fail to hit the thing!
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