Vergence Facility Prism (12D Base-Out/3D Base-In)

Vergence Facility Prism tool is a tool used to measure and train the dynamic speed of eye movement inward and outward. The tool consists of a square prism measuring 1.5 inches, made up of two prisms: 12D Base-Out / 3D Base-In. This tool is available in two versions: the first with a stick to hold the tool, and the second without a stick.