Many Free-form makers don't allow decentering because it increases the likelyhood of unwanted prism or reduced yields. If I have machinery that cost 2 Million, I would want to keep my yields high by making sure as many lenses as possible came off the line OK.
Some Free-form manufacturers use pre-marked blanks to reduce laser time as well. They cant be decentered. Although Decentration is possible, it increases the chance of unwanted prism and the tool falling off the blank. There are also blocking issues as well. Its a business decision to keep speed and yields higher.
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