HOW IS BINOCULARITY MAINTAINED DURING CONVERGENCE AND DIVERGENCE

The geometrical requirements for binocular fusion are stated, and the main features of horizontal vergence eye movements are described, toge ther with an influential schema of understanding the interaction betwe en vergence accommodation. The anatomy and physiology of the midbrain region implicated in vergence and accommodation control are discussed. The cortical areas from which suitable sensory signals might be deriv ed are mentioned briefly, and a speculation is made about esotropia.