Prism Testing (continued)
Phoria Testing - Near
1. Lower the reading rod to converge the Phoroptor to measure Near vision horizontal phorias.
2. Press the PRISM button, or touch PRISM.
3. Touch PHORIA to begin the test.
4. Select a vertical line of letters or the small block of letters on the Near Vision card for the
horizontal phoria test, and a single horizontal line of letters for the vertical phoria test.
5. Follow the steps in the previous section (Phoria Testing - Distance) to determine horizontal and
vertical phorias at near.
Note: The values for the Near Vision Phoria test are saved separately from the Distance Vision
test.
Figure IU-29, Vergence Testing Screen
Vergence Testing or Fusion Range Measurement - Distance
1. Press the PRISM button, or touch PRISM. (Please refer to Figure IU-29.)
2. Select VERGENCE in the menu bar at the bottom of the screen. This test automatically
advances through the steps of measuring:
• Power of Convergence
• Power of Divergence
• Infravergence (Right Eye and Left Eye)
• Supravergence (Right Eye and Left Eye)
Note: If you do not want to perform all steps in the Vergence test function, touch SKIP to omit a
specic step. Press it each time you want to skip a step in the test.
Instructions for Use (continued)
83
16241-101 Rev. D
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