Abstract: Embodiments of the invention provide patients with premium progressive lenses that are tailor-made to his or her specific and unique requirements and preferences. An interactive progressive lens optical design determining provides design technology that allows patients or eye care professionals to alter a progressive lens optical design in real-time, while continually displaying the selected lens' optical performance, until the most suitable lens has been designed. The progressive lens optical design determining software mixes and blends a number of cornerstone designs in varying ratios to achieve the desired lens.