Instructions for Use (continued)
Prism Testing
Prism lenses are built separately into the Phoroptor VRx and move in automatically when the prism test
is engaged.
Note: Not all models of the Phoroptor VRx come with prism compensators.
1. Press the PRISM button, or touch PRISM, to begin the Prism test.
Note:
The prism compensators automatically slide into place.
Note: When using any of the automated Prism tests (e.g., Phoria, Vergence, Binocular
Balance), the lens apertures are occluded initially when the prism compensators are
activated, and open after the prism power is in place.
Figure IU-26, Adjust Prism Values
Note: The small triangles next to the Prism box on the data table indicate the orientation and
direction of the Prism in each eye:
= Horizontal prism - Right Eye: Base In (BI), Left Eye: Base Out (BO)
= Horizontal prism - Right Eye: Base Out (BO), Left Eye: Base In (BI)
= Vertical prism - Right Eye and Left Eye: Base Up (BU)
= Vertical prism - Right and Left Eye: Base Down (BD)
2. Touch the box on the screen for the eye and the prism base orientation (horizontal or vertical)
you want to change.
3. Turn the CONTROL KNOB to add Prism in either the right or left eye.
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16241-101 Rev. D
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