Prism: Yoked Prism Frame with 360 Degree Compass and Adjustable Nose Piece

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These Yoked Prism Frames come with an elastic string and are available in 2 lens sizes: 38mm for pediatrics and 48mm for adults. These frames also come with a soft, pliable nose pi ece. Large thumbscrews are on each side so that each prism can be secured. The 360° compass or protractor helps to position the prism base. Show more