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A-A-53031 1987 Edition, June 29, 1987
Complete Document
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Includes all amendments and changes through Cancellation Notice 1, September 11, 2012
Additional Comments: CNCL NO S/S
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The General Services Administration has authorized the use of this commercial item description.

This Commercial Item Description covers two types of Berens prism bars:
    Type I -  Vertical Image Displacement
    Type II - Horizontal Image Displacement

The prism bars are to be used for vision screen tests to measure heterophoria or heterotropia in prism diopters and for converging and diverging exercises.