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LS-22A optical ophthalmic prism set with aluminium case with stainless steel handle 22pcs Feature: LS-22A Prism Set Specifications: Diopter(Δ): 1/2, 1, 2, 3,4,5, 6, 7,8, 9, 10, 12, 14, 16,18,20, 25, ...