Each Prism is sold individually.
Round Flat Plastic Prisms
Bevel-edged prisms made for flippers or prism training glasses. Base can be turned to any desired position. Powers and base conveniently marked on the prisms.
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.