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