3.5x Magnification Professional Loupes with Comfortable Headband 360-460mm Working Distance for Dental, Surgical, Jeweler, or Hobby | Adjustable Pupil Distance Model #CH350HBR

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.
Headband designs are the most comfortable, distributing the weight of the loupes across your head, making them feel much lighter. Comes with a resilient metal carry case instead of cloth.
Included accessories: Instructions, grip flip, lens cover, screwdriver, metal case.
Lightweight loupes with Galilean lens arrangement, very light for the quality, weighing less than a small cell phone (~47g).
Compound Optics, available in S (280-380), R (360-460), L (440-540), XL(500-600) working distances.
It is light plastic construction durable plastic and metal construction with advanced dual lens technology.
Pupil distance adjusts with one simple knob.
Field of View 60-65mm.