Ametek Reichert Phoroptor VRx User Manual page 84

Instructions for Use
Prism Testing
(continued)
Power of Divergence
The Vergence test automatically advances to measuring Power of Divergence after determining Power
of Convergence. If you do not want to perform this test, touch SKIP to advance. (Please refer to
Figures IU-30 & IU-31.)
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 touch BLUR.
4. Enter additional BI prism, until the patient sees two images.
5. Press the CONTROL KNOB, or touch BREAK.
6. Enter BO prism until the images converge again.
7. Press the CONTROL KNOB, or touch RECOVER.
Note: The amount of Prism at Blur/Break/Recovery appears in the designated boxes on the
screen and is saved.
84
(continued)
Figure IU-30, Power of Divergence - Blur Break
Figure IU-31, Power of Divergence - Recover
16241-101 Rev. D