Canon’s RK-F2 Auto Refractor offers 3-D Tracking The modern, compact, RK-F2 features advanced 3-D alignment and measurement for fast and accurate results Features Fully Automatic. Getting results is as easy as pressing one button. Simply align roughly on the pupil and initiate the measurement. The advanced intelligent automatic operation will take over. Alignment and measurement on both eyes will be done completely automatically, even the print-out is automatic. Large Tilting screen Corneal periphery measurements Retro Illumination mode Diameter measurement Extensive connectivity via LAN or RS-232