Fig. 1.

Left: Binocular open-view sensor, which includes IR laser (1050 nm), monitoring camera, and Hartmann-Shack sensor, all of them set at a lower level with respect to the subject's line of sight and reached through a twin periscope system and a wide IR hot mirror. The setup includes near and far targets combined using a beam splitter. Right: the view of the system. The hot mirror redirects the 1050-nm measurement beams from and to the lower level, making the system open-view. The subjects can readily shift their accommodation between far and near stimuli in natural viewing conditions.