Loose Risley Prims

Fits into the standard 38 mm eyewall of the Bernell-O-Scope™ or and standard trial lens frame. Each prism yields 20 PD for a total of 40PD. Now you can set any amount of BI, BO, or vertical prism into the steroscope to do training procedures. May be used for distance training by removing the cardholder. It may also be used with the new Bernell 3-D videos.

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