Lenti design is to reduce the edge zone out of vision zone to make the lens thinner and nicer but without affecting visual effects. Here are two separate examples of how to cut lens for minus and plus lens.

     Free4D is a combination of precision optics, the application of latest digital and visual optics technology, which allows users to adjust parameters and build their own unique progressive multi-focal designs. Free4D also can show power together with dimensions to be 4D display in cube. Free4D provides four different options for RX Labs.