Manufactured in Germany by Trusetal Verbandstoffwerk.
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Compare to: 3M™ Press-on™ Prisms; Fresnel
2-7/8″ x 2-7/8″ (75 x 75 mm) square, fully usable!
Press-on Prisms attach very easily to eye glasses. Comes in protective plastic container.
Other benefits are: Clearer image, Superior optical qualities, no yellowing, Thinner prisms at higher diopter values, Base and diopter strength clearly marked.