A lot of wearer’s and frame’s parameters had been taken in account in recent years in designing a progressive lens. Apart of traditional implicit parameters like pupillar distance, fitting height, back vertex distance or frame wrap, some behavioural parameters are also important.
One of these is related to different positions adopted by left and right handed people when engaged in intermediate or near vision tasks (e.g. writing on paper, smartphone or tablet). In order to help us writing as much as possible we tilt the paper or the device and it affects the overall visual performance. Therefore different corridor paths,intermediate and near zone shapes and positions are needed for a global optimization of the progressive lens.
That, along with WFRT® calculation on final surface’s geometry, gives the wearer the best visual experience.% | %