Josh McDermott continues MIT's course 9.35, Perception, with a lecture on binocular vision and how the brain uses input from two eyes to judge distance and depth. The seventy-six-minute session builds on prior material covering monocular depth cues, moving into stereopsis, binocular disparity, and how the visual system reconstructs a three-dimensional scene from two slightly offset two-dimensional images. McDermott works through the underlying geometry and the psychophysical evidence for how humans exploit these cues, connecting the material to broader questions about how perception constructs a stable sense of the world from ambiguous sensory input. The lecture is part of MIT's OpenCourseWare series and assumes familiarity with earlier sessions in the course, making it best suited to students already following the class rather than as a standalone introduction to vision science.