Vergence; Vergence Testing Or Fusion Range Measurement - Distance; Power Of Divergence; Power Of Convergence - Ametek Reichert Phoroptor VRx User Manual

Performing an Exam
Prism Testing
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Vergence

Vergence Testing or Fusion Range Measurement - Distance

1. Press the PRISM button, or tap Prism.
2. Tap Vergence in the menu bar at the bottom of the screen. This test automatically advances through
the steps of measuring:
•

Power of Divergence

• Infravergence (Right Eye and Left Eye)
Note: Tap Skip to omit a specific step in the Vergence test function. Tap it for each step in the test to
be skipped.
Power of Divergence
1. Set the acuity chart to a single vertical line of optotypes.
2. Enter BI prism slowly (starting from zero prism power), until the patient says the image is blurry.
3. Press the CONTROL KNOB, or tap Blur.
4. Enter additional BI prism, until the patient sees two images.
5. Press the CONTROL KNOB, or tap Break.
6. Enter BO prism until the images converge again.
7. Press the CONTROL KNOB, or tap Recover.
Note: The amount of Prism at Blur/Break/Recovery appears in the designated boxes on the screen and is saved.

Power of Convergence

1. Set the acuity chart to a single vertical line of optotypes at or near the patient's visual acuity.
2. Enter BO prism slowly in both eyes (starting from zero prism power), until the image is blurry to the
patient.
3. Press the CONTROL KNOB, or tap Blur.
4. Enter additional BO prism, if necessary, until the patient sees two images.
5. Press the CONTROL KNOB, or tap Break.
6. Enter BI prism until the images converge again.
7. Press the CONTROL KNOB, or tap Recover step in the test.
16241-101 Rev. E
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• Power of Convergence
• Supravergence (Right Eye and Left Eye)
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