Prism Testing
(continued)
Phoria
(continued)
Complete the Phoria Test
Tap
Set Prism
to set the patient’s Prism values to that determined by the Phoria test or tap
Save
to exit
the test and return the prisms to their previous values.
Phoria Testing - Near
1. Lower the reading rod to converge the Phoroptor to measure Near vision horizontal phorias.
2. Press the
PRISM
button, or tap
Prism
.
3. Tap
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
Phoria Testing - Distance
section to determine horizontal and vertical phorias
at near.
Note:
The values for the Near Vision Phoria test are saved separately from the Distance Phoria test.
Note:
Raising or lowering the reading rod during a phoria test will cancel the current test and start a
new test at the new distance.
Adjust Initial Values
1. To change prism starting values for a particular patient, tap
Adjust Initial Values
.
2. Turn the
CONTROL KNOB
to adjust the value for the selected Phoria base. Tap
Save
.
3. Press the
CONTROL KNOB
to switch to the opposite eye.
4. After the desired base values are set, press the
ENTER
key or tap
Save
to save the values and
return to the Phoria test.
5. Tap
Cancel
to discard the modified base values and return to the Phoria test.
Note:
The modified starting values are only set for the current exam. They will return to the original
default values when a new exam is started.
Performing an Exam
(continued)
60
16243-101 Rev. G
Содержание VISUTRON 900 Touch
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