Prism Testing - Ametek Reichert Phoroptor VRx User Manual

Performing an Exam

Prism Testing

Prism lenses move in automatically when the prism test is engaged.
Not all models of the Phoroptor VRx come with prism compensators.
1. Press the PRISM button, or tap Prism, to begin the Prism test.
Note: When using any of the automated Prism tests (e.g., Phoria,
Vergence, Binocular Balance), the lens apertures are
occluded initially when the prism lenses are activated, and
open after the prism power is in place.
Note: The small triangles next to the Prism box on the data table
indicate the orientation and direction of the Prism in each eye.
Refer to Figure PE-10.
= 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. Tap the box on the screen for the eye and the prism base orientation (horizontal or vertical) to be
changed.
3. Turn the CONTROL KNOB to modify Prism in either the right or left eye.
Note: Press and turn the CONTROL KNOB (at the same time) to add prism in 1.00 D increments.
Note: Tap XY/Polar to temporarily view the Prism in XY (BI/BO, BU/BD) or Polar Coordinates
(degrees).
Note: Tap Split to balance the current Prism power between both eyes.
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(continued)
Figure PE-10, Prism Values
16241-101 Rev. E