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I get exactly the same lens from Vision Direct, as I would from my friendly neighbourhood optician but at about half price. They come sealed in the same foil containers, inside the same sealed boxes, and they are made by the same people.... Acuvue Oasys. Most people I know no longer use opticians for anything other than eye tests, which I have done every 12 months. Glasses are different of course, but contact lens are the same the world over.
The same argument was used by Opticians when people wanted simple reading glasses. You couldn't get then anywhere except High Street opticians, but now you can get them anywhere you want, as the daft law was changed. 100,000's of reading glasses are sold outside of Opticians these days and rightly so.
I used to get my lens from D+A direct, via my Optician, which is now re-badged as Boots. But why should I pay twice the price ? They also used to charge me twice the price for the same fluid that I can get in Tesco, or Superdrug. I stopped wasting money a long time ago.
PP...your question about dentures is plain silly ! How would you get a perfect fit, sitting in front of your PC screen !