This product has flexible system integration and can be synchronized with NIDEK Smart Refractor for more refined and smoother examnations. When synchronized, chart image adjustments are possible via the Smart Refractor control box. Features include: polarized charts for binocular test (only for SC-1600Pola system), a smart display function, a contrast test, changeable working distances, and the indication of slide images for the SC-1600Pola / 1600 can be stored on a SD memory card.