Performing an Exam
(continued)
Binocular Balance
1. Press the
BB
button, or tap
BB
on the main screen, to begin Binocular Balance.
2. The Binocular Balance test automatically places prism in each eye (3D base down in the right eye
and 3D base up in the left eye), and fogs the left and right eye.
Note:
The sphere values automatically fog by the amount specified in the Settings menu.
3. Verify that the patient can see two images, one up and one down.
• Tap
Prism
to adjust the Prism values if the patient cannot see two images.
• Tap
Set Prisms
to save the modified Prism values.
4. Ask the patient: “Which image is clearer, the top or the bottom?”
• If the top image is clearer, increase sphere in the right eye.
• If the bottom image is clearer, increase sphere in the left eye.
5. Adjust sphere until both lines look equal.
6. Press the
CONTROL KNOB
, or tap
Equal
.
7. Decrease sphere in both eyes to reach the best visual acuity.
8. Press the
CONTROL KNOB
, or tap
Save
to complete the test.
54
16243-101 Rev. G
Summary of Contents for VISUTRON 900 Touch
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Page 85: ...Notes 85 16243 101 Rev G ...
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