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5. OPERATION FOR TESTS
4 Measure the changed convergence.
When the ADD power is shifted by "+1.00D", the adjustment equal to 1.00D is cancelled
in the patient's eye and the convergence is changed.
Measure the changed convergence in the same way as the horizontal phoria measure-
ment.
The image the patient sees is separated vertically because of the prism inserted at the
right eye. The patient sees the upper section with the right eye and the lower section,
with the left eye.
Because the adjustment of 1.00D is cancelled, possibly divergence will occur in the
patient's eye. Therefore, as the illustration at the right of "Mouse Navigation", the upper
character line is disassociated rightward and the lower character line, leftward in the
patient's vision initially.
Ask the patient how the upper and lower character lines are positioned in his/her vision.
Then, operate the mouse according to "Mouse Navigation" until the upper and lower
character lines are aligned.
At the same time, as the example shown at the right, the
AC/A ratio value is calculated and displayed in "Mini Help".
5 Record the result.
After the measurement, click the [Record] button to record the result.
The AC/A ratio measurement is finished.
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