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No, he is correct. When they were first introduced to the market, you really were a 'nodding dog' but as they have improved, the head movement is far less pronounced. The more expensive the lens (and they are improving year on year) the better the way the focal 'channels' are put to use. I have a severe short-sight defect ( measles at a very young age ) so have made use of this technology and its improvements over the years. I pay big bucks as I do not like a heavy lens, give me a headache, so I choose to pay for the lighter, thinner ones.That is indeed the "trick" to it. When I told the optician that I was not keen on becoming a "nodding dog" he assured me that that was all "old hat" and the newer lenses were far more subtle. I think he fibbed.
Stick wif 'em, you'll win!