Prism Testing
(continued)
Vergence
(continued)
Infravergence and Supravergence can now be measured in each eye.
Infravergence
1. Enter BD prism slowly, until the patient sees two images.
2. Press the
CONTROL KNOB
, or tap
Break
.
3. Enter BU prism until the images converge again.
4. Press the
CONTROL KNOB
, or tap
Recover
. The amount of Prism at Break and Recovery appears
in the designated boxes on the screen and is saved
Supravergence
1. Enter BU prism slowly, until the patient sees two images. (Please refer to Figures IU-36 & IU-37.)
2. Press the
CONTROL KNOB
, or tap
Break
.
3. Enter BD prism until the images converge again.
4. Press the
CONTROL KNOB
, or tap
Recover
. The amount of Prism at Break and Recovery appears
in the designated boxes on the screen and is saved.
Vergence Testing or Fusion Range Measurement - Near
Measure vergence for near vision using the following steps:
1. Lower the reading rod to converge the Phoroptor.
2. Press the
PRISM
button, or tap
Prism
.
3. Select
Vergence
in the menu bar at the bottom of the screen.
4. Follow the steps for measuring distance vergence as described in the
Vergence Testing or Fusion
Range Measurement - Distance
section.
Note:
Raising or lowering the reading rod during a vergence test will cancel the current test and start a
new test at the new distance.
Performing an Exam
(continued)
62
16243-101 Rev. G
Summary of Contents for VISUTRON 900 Touch
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