PRM1-S22
The S-22 loose prism set is designed to aid in the measurement of phoria deviations. High grade Lucite insures a precise surface quality. Includes the following diopters:
Loose Prism Set - large. 1/2、1、2、3、4、5、6、7、8、9、10、12、14、16、18、20、 25、30、35、40、45、50 + Red Lens
Held in attractive Wooden box for storage ( see photo)