Potec PLC-8000 - Black;White Reverse Chart Function; Schober Chart Function

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13. Black/White Reverse Chart Function
 While the visual acuity chart is indicated, press the Reverse button. The Black-and-
White condition of the chart being indicated is reversed.
Picture 6 picture 7
14. Schober Chart Function
 Auxiliary lens: Red filter on the right eye, green filter on the left eye
Subject’s vision Button Correction
Mask_ Right Add the BO prism powers until the cross comes to the
center of the circle
Mask_Left Add the BI prism powers until the cross comes to the
center of the circle
Mask_Up Add the BU prism power to the right eye and BD
prism power to the left eye until the cross comes to
the center of the circle
Mask_Down Add the BD prism power to the right eye and BU
prism power to the left eye until the cross comes to
the center of the circle