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Spark Professional Loupes come in many models and working distances, with clip-on, headband, and attached headlight models available. Product ships with regular(R) working distance unless you send us a message with a size, custom distances can be made upon request as well. Distance in Millimeters. Loupes can be worn without prescription lenses if you are not strongly near or far-sighted,but if your prescription is over 200 or 2.25(positive or negative)it is strongly recommended that you use clip-on loupes,headband loupes, ask us for the half frames,or have prescription lenses put in to your frames for metal frames(sports frames need to require RX inserts,which we can provide). Specification: Anti-glare coating which reduces light reflection to 0.3%. Full clarity of vision across entire field of view, no blurring around the edges. Adjustable pupil distance and viewing angle. All frame models have a convenient, flip-up design. Included accessories: Instructions, grip flip, lens cover, head strap, screwdriver, cloth case.
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