Prism Testing (continued)
Power of Convergence
1. Set the acuity chart to a single vertical line of optotypes at or near the patient’s visual acuity.
(Please refer to Figures IU-32 & IU-33.)
2. Enter BO prism slowly in both eyes (starting from zero prism power), until the patient states that
the image is blurry.
3. Press the CONTROL KNOB, or touch BLUR.
4. Enter additional BO prism, if necessary, until the patient sees two images.
5. Press the CONTROL KNOB, or touch BREAK.
6. Enter BI 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.
Instructions for Use (continued)
Figure IU-32, Power of Convergence - Blur Break
Figure IU-33, Power of Convergence - Recover
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16241-101 Rev. D
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