Screen vergence facility and binocular vision with the Good-Lite Vergence Facility Prism. This set pairs a 12D base-out prism with a 3Δ base-in prism. At a working distance of 16 in (40 cm), use a 20/30 near-point line and have the patient alternate between the two prisms, up to 15 cycles per minute.

Each prism is 1.5 in (38 mm) high. Choose a version mounted on a stainless steel holder, an unmounted loose version, or a magnetic version that can be used mounted or loose.