This book describes the fundamentals of binocular vision. It is intended for students of optometry, ophthalmology and orthoptics. The chapters are: Visual Direction The Horopter Spatial Distortions Induced by Image Magnification Fusion Binocular Rivalry Principles of Human Depth Perception: Monocular cues to absolute and relative distance Principles of Human Depth Perception: Binocular cues to absolute and relative distance Binocular Summation