Professor of Optometry and Vision Science and Affiliate Professor of Psychology and Engineering at the University of California, Berkeley Stereoscopic displays present different images to the two eyes and thereby create a compelling three-dimensional (3-D) sensation. They are being developed for numerous applications including cinema, television, virtual prototyping and medical imaging. However, stereoscopic displays cause perceptual distortions, performance decrements and visual fatigue. These problems occur because some of the presented depth cues (i.e., perspective and binocular disparity) specify the intended 3-D scene while focus cues (blur and accommodation) specify the fixed distance of the display itself. We have developed a stereoscopic display that circumvents these problems. It consists of a fast switchable lens (>1 kHz) synchronized to the display such that focus cues are nearly correct. The system has great potential for both basic vision research and display applications. I will discuss the optical properties of the display and how one might use this technology to produce a display that would be indistinguishable from the real world. I will also discuss recent research that shows that using multifocal technology improves visual performance and reduces visual fatigue.