DONEGAN , OPTIVISOR, Made in the USA , Binocular headband magnifier provides hands-free magnification and viewing for a variety of applications such as jewelry-making, watch-making, needlework, artwork, electronic inspection, book-reading, print inspection, and stamp-collecting Available in multiple dioptric strengths (indicated by the model number) that provide a specific magnification power (X), depending on the distance from the object Acrylic lenses are ground and polished into prismatic lenses for quality and clarity; lighter weight than glass lenses .A dioptric number and a magnification number are not the same thing. Diopter strength represents a specific magnification power (X). For example, a 5-diopter provides 2.5X magnification (at a distance of 8"). Can be worn over prescription or safety eyeglasses
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