Yoked Prism Frame with 360 Degree Compass and Adjustable Nose Piece608700
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- Yoked Prism Frames with elastic string are available in 2 lens sizes: 38 mm for Pediatrics, and 48 mm for adults. Comes with comfortable and soft adjustable nose piece. Comes with large thumb screw on each side so that each prism can be secured.
A 360° compass or protractor which helps to accurately position the prism base.