48mm Flat Prisms. Each prism is sold individually.
Bevel-edged prisms made for adult prism training goggles. Base can be turned to any desired position. Powers and base conveniently marked on the prisms.
Flat prisms allow for training with maximum prismatic distortions of the patient's field.
Note: Prism diopter powers are listed per lens. For example, a 4PD goggle will have two 4PD lenses to make a 8PD range. So, 4PD goggle = 8PD range.