A prism box with loose prisms from 1 to 80 Δ, each in its own place in the box.
With the loose prisms you measure deviations of the eye position, including larger ones. The box is compact and light (860 g), so it fits on any examination table and is easy to take to another room.
Which orthoptic instrument measures what? Read our guide: Orthoptic instruments: what each one measures.
