Free-form progressive powered lenses Improving outcomes, reducing mistakes
Free-form lenses have their surfaces digitally manufactured, allowing point-to-point surfacing in which the lens surface curvature can be controlled over thousands of individual points.
In order to dispense a pair of free-form progressive power lenses (PPL), there are several measurements that need to be included, in addition to what is normally expected for a traditionally manufactured PPL.
This article covers the manufacturing process of free-form progressive lenses, including the specialist measurements required and the relationships between these measurements. In addition, non-tolerances are discussed and trouble shooting advice is offered to reduce these in practice.
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