Josh McDermott continues MIT's 9.35 Perception lecture on the eye and retina, covering how retinal cells encode visual information before it reaches the brain. Part of the Spring 2024 course offered through MIT OpenCourseWare, this session builds on a prior class and works through the mechanics of photoreceptors and downstream retinal circuitry that shape what the visual system can detect. At roughly 74 minutes, it runs as a full lecture rather than a highlight reel, with McDermott working through the material at the pace of an actual class session. The lecture sits within a broader course on perception, so the retina is treated as the first stage in a longer story about how the brain constructs visual experience. Useful for students of neuroscience, psychology, or vision science who want the technical grounding rather than a simplified overview.