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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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