Vision Care Product News

APR 2016

Product information for optical people.

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Page 92 of 115

V C T Renault and later Citroen. With the advent of computerized 3-D graphing, these computations are the basis for modern computer-aided design and graphic design today. They are what tell your dentist's 3-D printer how to shape your new crown, and they are what send your eyecare professional's tracer and edger the shape to fabricate lenses. They are still referred to today as "Bézier Curves." Why is this important to an ECP? Knowing that engineers have already fgured out the math lets you feel as- sured that the reproduction of unique shapes is possible. For example, the Weco E.6 edger combined with the Weco C.6 optical-camera-assisted- Gravitech tracing system's Bézier Curve algorithms put the "Smart" in the company's Smart Design 2.0 tech- nology. Knowing this lets you use your wildest imagination in determining the lens shape of your next three-piece rimless mounting. STYLUS TRACING STILL IN STYLE Not all methods of determining lens shapes are the same. With that said, do not discount a particular type of machine just because it uses a tried- and-true method such as "stylus" trac- ing. Today's stylus tracers not only determine the basic two-dimensional shape that frst-generation tracers could, but they also determine exact three-dimensional bevel placement for wrapped frames. They match bevel depth to bezel depth, making delicate- ly small bevels for thin metal frames and up to mega Z87.1 industrial bevels for safety frames. They can determine With so much computerization built into optical machines these days, it's easy to overlook the technology that makes them work. If you own a tracer or are considering the purchase of one, either built into a fnishing system or a stand-alone unit, you can make them perform better if you understand what makes them tick. ALGORITHMS SEE IN 3-D Reproduction of three-dimensional shapes requires the use of complex algorithms that predict alignment of the next pixel in a continuous three- axis graph. The mathematical basis for these algorithms was frst discov- ered in 1912. However, it wasn't un- til 1962 when the French engineer Pierre Bézier used them to produce the shapes that formed auto bodies for VCPN VISIONCAREPRODUCTS.COM The Briot Perception's stylus-free shape recognition can determine the exact bevel required to match a frame's curve in the X, Y and Z axes.

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